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A006523 Sum ((-1)^(i+1)*binomial(n,i)*2^i*(2*n-1)!,i=1..n) for n odd. 0
2, 240, 725760, 12454041600, 711374856192000, 102181884343418880000, 31022420086661971968000000, 17683523987479403909087232000000, 17366635237623772991036388802560000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..9.

CROSSREFS

Sequence in context: A217972 A071967 A024348 * A055968 A074256 A146312

Adjacent sequences:  A006520 A006521 A006522 * A006524 A006525 A006526

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified September 26 04:27 EDT 2017. Contains 292502 sequences.