显示找到的5个结果中的1-5个。
第页1
1, 0, 1, 0, 1, 1, 0, 1, 2, 1, 0, 0, 3, 3, 1, 0, 0, 2, 6, 4, 1, 0, 0, 1, 7, 10, 5, 1, 0, 0, 0, 6, 16, 15, 6, 1, 0, 0, 0, 3, 19, 30, 21, 7, 1, 0, 0, 0, 1, 16, 45, 50, 28, 8, 1, 0, 0, 0, 0, 10, 51, 90, 77, 36, 9, 1, 0, 0, 0, 0, 4, 45, 126, 161, 112, 45, 10, 1, 0, 0, 0, 0, 1, 30, 141, 266, 266
评论
读作数字三角形,这是Riordan数组(1,x(1+x+x^2)),T(n,k)=Sum_{i=0..floor((n+k)/2)}C(k,2i+2k-n)*C(2i+2k-n,i)。行以{1}、{0,1}、}0,1,1},{0,1,2,1},}0,0,3,3,1}开始,。。。行和就是三项数字A000073号(n+2)。对角线总和为A013979号. -保罗·巴里2005年2月15日
配方奶粉
T(n,k)=T(n-1,k)+T(n-1,k-1)+T。请参见A027907号了解更多信息。
作为数字三角形,T(n,k)=Sum_{i=0.floor((n-k)/2)}C(n-k-i,i)*C(k,n-k-i)-保罗·巴里2005年4月26日
例子
行开始
1, 0, 0, 0, 0, 0, ...;
1, 1, 1, 0, 0, 0, 0, ...;
1, 2, 3, 2, 1, 0, 0, ...;
1, 3, 6, 7, 6, 3, 1, 0, ...;
1, 4, 10, 16, 19, 16, 10, 4, 1, ...; 等。
数学
T[n_,k_]:=总和[二项式[n-k-j,j]*二项式[k,n-k-j],{j,0,
楼层[(n-k)/2]}];表[T[n,k],{n,0,10},{k,0,n}]//展平(*G.C.格鲁贝尔2017年2月28日*)
组合数字C^(3)(n,k)的三角形,n个不同元素在k上重复,每个元素的出现次数不超过三次。
+10 7
1, 1, 1, 1, 2, 3, 1, 3, 6, 10, 1, 4, 10, 20, 31, 1, 5, 15, 35, 65, 101, 1, 6, 21, 56, 120, 216, 336, 1, 7, 28, 84, 203, 413, 728, 1128, 1, 8, 36, 120, 322, 728, 1428, 2472, 3823, 1, 9, 45, 165, 486, 1206, 2598, 4950, 8451, 13051, 1, 10
配方奶粉
C^(3)(n,k)=和{r=0,…,floor(k/4)}(-1)^r*C(n,r)*C(n-4*r+k-1,n-1)
例子
三角形开始
不适用|。。0.....1.....2.....3.....4.....5.....6.....7
==================================================
.0..|..1
.1..|..1.....1
.2..|..1.....2.....3
.3..|..1.....3.....6....10
.4..|..1.....4....10....20....31
.5..|..1.....5....15....35....65....101
.6..|..1.....6....21....56...120....216...336
.7..|..1.....7....28....84...203....413...728....1128
数学
压扁[表[Sum[(-1)^r二项式[n,r]二项式[n-#r+k-1,n-1],{r,0,Floor[k/#]}],{n,0,15},{k,0,n}]/。{0}->{1}]&[4] (*彼得·J·C·摩西2013年4月16日*)
T(n,k)=nXk 0..3数组的数量,其中行的字典顺序不变,列的字典顺序也不变,但只有一个错误。
+10 7
0, 6, 6, 40, 152, 40, 155, 1947, 1947, 155, 456, 17352, 58904, 17352, 456, 1128, 121520, 1410818, 1410818, 121520, 1128, 2472, 712406, 28637916, 99992428, 28637916, 712406, 2472, 4950, 3633649, 506031118, 6410559865, 6410559865, 506031118
评论
表格开始
.....0.........6.............40.................155......................456
.....6.......152...........1947...............17352...................121520
....40......1947..........58904.............1410818.................28637916
...155.....17352........1410818............99992428...............6410559865
...456....121520.......28637916..........6410559865............1351385130108
..1128....712406......506031118........374757577056..........268284486351027
..2472...3633649.....7907770636......19983433877142........50067074390669892
..4950..16547278...110655824716.....971720519011047......8732216738504713198
..9240..68531079..1401584381570...43159978267689118...1415177080112634284232
.16302.261693631.16222274394016.1757375854436887414.212485358907612452321760
配方奶粉
k列的经验值:
k=1:[七次多项式]
k=2:[28次多项式]
k=3:[109次多项式]
例子
n=3k=4的一些解
..0..0..2..0. .0..0..3..1. .0..0..2..0. .1..0..2..1. .0..0..2..1
..1..1..1..0. .1..0..1..1. .1..0..1..0. .1..1..2..1. .1..0..1..2
..2..1..2..0. .1..1..3..0. .3..0..1..3. .2..3..0..1. .1..2..2..1
T(n,k)=nXk 0..3数组的数量,其中行和列的字典顺序不减,但只有一个错误。
+10 6
0, 6, 6, 40, 100, 40, 155, 1609, 1609, 155, 456, 19624, 57760, 19624, 456, 1128, 178352, 2116789, 2116789, 178352, 1128, 2472, 1287838, 67971132, 223202074, 67971132, 1287838, 2472, 4950, 7795151, 1796061464, 23450120081, 23450120081, 1796061464
评论
表格开始
....0.......6.........40...........155..............456................1128
....6.....100.......1609.........19624...........178352.............1287838
...40....1609......57760.......2116789.........67971132..........1796061464
..155...19624....2116789.....223202074......23450120081.......2266913897519
..456..178352...67971132...23450120081....7817299555828....2573951428892959
.1128.1287838.1796061464.2266913897519.2573951428892959.2817080307689646420
配方奶粉
k列的经验值:
k=1:[七次多项式]
k=2:[多项式31次]
k=3:[127次多项式]
例子
n=3k=4的一些解
..0..0..0..3. .0..0..2..0. .0..0..2..2. .0..0..1..3. .0..0..0..1
..1..1..3..0. .0..1..0..0. .0..2..3..0. .1..3..2..1. .1..1..3..0
..0..3..3..0. .0..1..3..2. .0..3..2..1. .0..3..0..1. .0..2..2..2
3, 31, 155, 546, 1554, 3823, 8451, 17205, 32802, 59268, 102388, 170261, 273975, 428418, 653242, 973998, 1423461, 2043165, 2885169, 4014076, 5509328, 7467801, 10006725, 13266955, 17416620, 22655178, 29217906
配方奶粉
a(n)=A008287号(n+3,8)=二项式(n+3,3)*(n^5+46*n^4+875*n^3+7118*n^2+23880*n+20160)/(8!/3!),n>=0。
G.f.:(3+4*x-16*x^2+15*x^3-6*x^4+x^5)/(1-x)^9,分子多项式是数组中的N4(8,x)A063421号.
数学
表[3二项[n+3,3]+19二项[n+3,4]+30二项[n+3,5]+21二项[n+3,6]+7二项[nC+3,7]+二项[ns+3,8],{n,0,30}](*哈维·P·戴尔2022年4月30日*)
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