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A024420 n!(1/binomial(n,0) - 1/binomial(n,1) + ... + d/binomial(n,[ n/2 ])), where d = (-1)^[ n/2 ]. 0
1, 1, 1, 4, 22, 108, 612, 4416, 36576, 331200, 3319200, 36806400, 445046400, 5813579520, 81716947200, 1230656716800, 19761225523200, 336973967769600 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..17.

CROSSREFS

Sequence in context: A184701 A001436 A224243 * A220457 A108840 A007994

Adjacent sequences:  A024417 A024418 A024419 * A024421 A024422 A024423

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified May 26 07:44 EDT 2019. Contains 323579 sequences. (Running on oeis4.)