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A024176 (n+2)!(1/3 - 1/4 + ... + c/(n+2)), where c=(-1)^(n+1). 1
2, 2, 34, 84, 1308, 5424, 89136, 528480, 9442080, 73388160, 1433047680, 13835646720 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

FORMULA

a(n) = 2*A024188(n)

PROG

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

CROSSREFS

Sequence in context: A018976 A074127 A297795 * A286375 A056612 A131658

Adjacent sequences:  A024173 A024174 A024175 * A024177 A024178 A024179

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified October 17 16:51 EDT 2019. Contains 328120 sequences. (Running on oeis4.)