来自在线整数百科全书的问候语!http://oeis.org/ Search: id:a008501 Showing 1-1 of 1 %I A008501 %S A008501 1,9,45,165,495,1287,3003,6435,12869,24301,43713,75417,125475,202203, %T A008501 316767,483879,722601,1057265,1518517,2144493,2982135,4088655,5533155, %U A008501 7398411,9782829,12802581,16593929 %N A008501 7-dimensional centered tetrahedral numbers. %C A008501 If X is an n-set and Y a fixed 8-subset of X then a(n-8) is equal to the number of 8-subsets of X intersecting Y. - _Milan Janjic_, Jul 30 2007 %H A008501 Vincenzo Librandi,n,a(n)n=0…10000的表米兰HA88501两个枚举函数%H A000 8501常系数线性递归的索引项签名(8,-28,56,-70,56,-28,8,1)。(1-x ^ 8)/(1-x)^=(1 +x)*(1 +x^ 2)*(1 +x^ 4)/(x-1)^ 8。- _R. J. Mathar_, Mar 14 2011 %t A008501 Table[Binomial[n + 8, 8] - Binomial[n, 8], {n, 0, 26}] (* _Bruno Berselli_, Mar 22 2012 *) %o A008501 (MAGMA) [((2*n+1)*(n^6+3*n^5 +100*n^4 +195*n^3 +1159*n^2 +1062*n +1260)/1260) : n in [0..30]]; // _Vincenzo Librandi_, Oct 08 2011 %K A008501 nonn,easy %O A008501 0,2 %A A008501 _N. J. A. Sloane_ # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE