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 A008598 Multiples of 16. 27
 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 INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 328 Milan Janjic, Two Enumerative Functions Tanya Khovanova, Recursive Sequences Luis Manuel Rivera, Integer sequences and k-commuting permutations, arXiv preprint arXiv:1406.3081 [math.CO], 2014-2015. Leo Tavares, Illustration: Square Block Star Frames Index entries for linear recurrences with constant coefficients, signature (2,-1). FORMULA a(n) = Sum_{k=1..8n} (i^k+1)*(i^(8n-k)+1), where i=sqrt(-1). - Bruno Berselli, Mar 19 2012 G.f.: 16*x/(x-1)^2. - Vincenzo Librandi, Jun 10 2013 a(n) = A014641(n) - A185212(n). - Leo Tavares, May 24 2022 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. Cf. A014641, A185212. Sequence in context: A044856 A217558 A044901 * A044061 A033028 A044841 Adjacent sequences: A008595 A008596 A008597 * A008599 A008600 A008601 KEYWORD nonn,easy AUTHOR N. J. A. Sloane STATUS approved

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Last modified September 10 23:44 EDT 2024. Contains 375795 sequences. (Running on oeis4.)