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A011931 [ n(n-1)(n-2)(n-3)/21 ]. 0
0, 0, 0, 0, 1, 5, 17, 40, 80, 144, 240, 377, 565, 817, 1144, 1560, 2080, 2720, 3497, 4429, 5537, 6840, 8360, 10120, 12144, 14457, 17085, 20057, 23400, 27144, 31320, 35960, 41097, 46765, 53001, 59840 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Table of n, a(n) for n=0..35.

FORMULA

a(n) = +4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4) +a(n-7) -4*a(n-8) +6*a(n-9) -4*a(n-10) +a(n-11). [From R. J. Mathar, Apr 15 2010]

CROSSREFS

Sequence in context: A146272 A147035 A146134 * A260981 A078866 A144620

Adjacent sequences:  A011928 A011929 A011930 * A011932 A011933 A011934

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified August 18 16:13 EDT 2018. Contains 313833 sequences. (Running on oeis4.)