A171002 - OEIS

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A171002

Binomial(n-k,k) * binomial(n-k-1,k+1) where k = ceiling(n/4).

0, 0, 0, 3, 0, 6, 40, 150, 100, 525, 1960, 5880, 7056, 26460, 83160, 228690, 365904, 1189188, 3435432, 9018009, 17177160, 51531480, 141581440, 361032672, 773641440, 2204878104, 5859116640, 14647791600, 34178180400, 93989996100, 243891989880, 601019546490

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,4

LINKS

Table of n, a(n) for n=1..32.

CROSSREFS

Cf. A171001, A171003, A171006.

Sequence in context: A270509 A083350 A002043 * A375987 A137436 A099893

Adjacent sequences: A170999 A171000 A171001 * A171003 A171004 A171005

KEYWORD

nonn

AUTHOR

John P. Linderman, Sep 01 2010

STATUS

approved