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A008598 Multiples of 16. 22
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,changed

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified April 26 03:45 EDT 2017. Contains 285426 sequences.