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A024421 a(n) = n!(1/C(n,0) - 1/C(n,1) - ... - 1/C(n,[ n/2 ])). 0
1, 1, 1, 4, 14, 84, 516, 3936, 32544, 305280, 3123360, 35112960, 427559040, 5629236480, 79568697600, 1203310080000, 19381043404800, 331357630464000 (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: A003707 A063862 A222497 * A259353 A202139 A190481

Adjacent sequences:  A024418 A024419 A024420 * A024422 A024423 A024424

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified June 16 04:54 EDT 2019. Contains 324145 sequences. (Running on oeis4.)