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A024189 ((n+3)!/2)(1/4 - 1/5 + ... + c/(n+3)), where c = (-1)^(n+1). 0
3, 3, 78, 186, 4008, 15912, 340560, 1931760, 43139520, 321312960, 7611891840, 70589232000, 1783264896000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..13.

PROG

(PARI) a(n) = (n+3)!/2*sum(x=1, n, (-1)^(x+1)/(x+3)) \\ Michel Marcus, Mar 21 2013

CROSSREFS

Sequence in context: A126227 A213137 A260076 * A217542 A007451 A087542

Adjacent sequences:  A024186 A024187 A024188 * A024190 A024191 A024192

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified October 16 07:30 EDT 2019. Contains 328051 sequences. (Running on oeis4.)