显示找到的2个结果中的1-2个。
第页1
如果k<=n<=2k,则数字三角形A(n,k)的逆行和=1/(3n+1),否则为0。
+10 三
1, 4, 3, 7, 3, 6, 3, 10, 3, 6, 3, 9, 3, 6, 3, 13, 3, 6, 3, 9, 3, 6, 3, 12, 3, 6, 3, 9, 3, 6, 3, 16, 3, 6, 3, 9, 3, 6, 3, 12, 3, 6, 3, 9, 3, 6, 3, 15, 3, 6, 3, 9, 3, 6, 3, 12, 3, 6, 3, 9, 3, 6, 3, 19, 3, 6, 3, 9, 3, 6, 3, 12, 3, 6, 3, 9, 3, 6, 3, 15, 3, 6, 3, 9, 3, 6, 3, 12, 3, 6, 3, 9, 3, 6, 3, 18, 3, 6, 3, 9, 3, 6, 3, 12, 3, 6
评论
这一推测至少在2048个第一学期之前是正确的。(但请注意不同的索引,这里以0为基础。)-安蒂·卡图恩2018年9月29日
数学
A[n_,k_]:=如果[k<=n<=2k,1/(3n+1),0];
总计/@Inverse[Array[A,{128,128},{0,0}]](*让-弗朗索瓦·奥尔科弗2021年2月11日*)
黄体脂酮素
(PARI)
up_to=128;
A127752aux(n,k)=如果(k<=n,如果(n<=(2*k),1/((3*n)+1),0),0;
A127752list(up_to)={my(m1=矩阵(up_to,up_to,n,k,A127752aux(n-1,k-1)),m2=矩阵解算(m1,matid(up_tto)),v=向量(up_to-));对于(n=1,up_tto,v[n]=向量(m2[n,]);(v);};
v127752=A127752列表(1+up_to);
如果k<=n<=2k,则数三角形A(n,k)的倒数=1/(2n+1),否则为0。
+10 2
1, 0, 3, 0, -3, 5, 0, 3, -5, 7, 0, 0, 0, -7, 9, 0, -3, 5, 0, -9, 11, 0, 0, 0, 0, 0, -11, 13, 0, 3, -5, 7, 0, 0, -13, 15, 0, 0, 0, 0, 0, 0, 0, -15, 17, 0, 0, 0, -7, 9, 0, 0, 0, -17, 19, 0, 0, 0, 0, 0, 0, 0, 0, 0, -19, 21, 0, -3, 5
例子
三角形开始
1;
0, 3;
0, -3, 5;
0, 3, -5, 7;
0, 0, 0, -7, 9;
0, -3, 5, 0, -9, 11;
0, 0, 0, 0, 0, -11, 13;
0, 3, -5, 7, 0, 0, -13, 15;
0, 0, 0, 0, 0, 0, 0, -15, 17;
0, 0, 0, -7, 9, 0, 0, 0, -17, 19;
0, 0, 0, 0, 0, 0, 0, 0, 0, -19, 21;
0, -3, 5, 0, -9, 11, 0, 0, 0, 0, -21, 23;
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -23, 25;
三角形的逆
1;
0, 1/3;
0, 1/5, 1/5;
0, 0, 1/7, 1/7;
0, 0, 1/9, 1/9, 1/9;
0, 0, 0, 1/11, 1/11, 1/11;
0, 0, 0, 1/13, 1/13, 1/13, 1/13;
0, 0, 0, 0, 1/15, 1/15, 1/15, 1/15;
0, 0, 0, 0, 1/17, 1/17, 1/17, 1/17, 1/17;
0, 0, 0, 0, 0, 1/19, 1/19, 1/19, 1/19, 1/19;
0, 0, 0, 0, 0, 1/21, 1/21, 1/21, 1/21, 1/21, 1/21;
MAPLE公司
选项记忆;
如果k>n,则
0 ;
elif k=n那么
2*n+1;
其他的
-(2*k+1)*add(procname(n,i)/(2*i+1),i=k+1..min(n,2*k));
结束条件:;
结束过程:
数学
nmax=10;
A[n_,k_]:=如果[k<=n<=2k,1/(2n+1),0];
invA=逆[表[A[n,k],{n,0,nmax},{k,0,nmax}]];
T[n_,k_]:=invA[[n+1,k+1]];
表[T[n,k],{n,0,nmax},{k,0,n}]//扁平(*让-弗朗索瓦·奥尔科弗2020年10月5日*)
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