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 A008598 Multiples of 16. 24
 0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240, 256, 272, 288, 304, 320, 336, 352, 368, 384, 400, 416, 432, 448, 464, 480, 496, 512, 528, 544, 560, 576, 592, 608, 624, 640, 656, 672, 688, 704, 720, 736, 752, 768, 784, 800, 816, 832 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS If X is an n-set and Y_i (i=1,2,3,4) mutually disjoint 2-subsets of X then a(n-6) is equal to the number of 5-subsets of X intersecting each Y_i (i=1,2,3,4). - Milan Janjic, Aug 26 2007 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Milan Janjic, Two Enumerative Functions Tanya Khovanova, Recursive Sequences INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 328 Luis Manuel Rivera, Integer sequences and k-commuting permutations, arXiv preprint arXiv:1406.3081, 2014 Index entries for linear recurrences with constant coefficients, signature (2,-1). FORMULA a(n) = sum((i^k+1)*(i^(8n-k)+1), k=1..8n), where i=sqrt(-1). - Bruno Berselli, Mar 19 2012 G.f.: 16*x/(x-1)^2. - Vincenzo Librandi, Jun 10 2013 MAPLE A008598:=n->16*n; seq(A008598(n), n=0..100); # Wesley Ivan Hurt, Nov 13 2013 MATHEMATICA Range[0, 1000, 16] (* Vladimir Joseph Stephan Orlovsky, May 31 2011 *) CoefficientList[Series[16 x / (x - 1)^2, {x, 0, 60}], x] (* Vincenzo Librandi Jun 10 2013 *) PROG (PARI) a(n)=16*n \\ Charles R Greathouse IV, Sep 24 2015 CROSSREFS Cf. A008596, A008597. Sequence in context: A044856 A217558 A044901 * A044061 A033028 A044841 Adjacent sequences:  A008595 A008596 A008597 * A008599 A008600 A008601 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified October 21 20:44 EDT 2019. Contains 328315 sequences. (Running on oeis4.)