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A068878 sin(x)+exp(x)-1-2x=sum(n>=1,x^(2n)/a(n)). 0
2, 24, 60, 720, 40320, 181440, 3628800, 479001600, 3113510400, 87178291200, 20922789888000, 177843714048000, 6402373705728000, 2432902008176640000, 25545471085854720000, 1124000727777607680000, 620448401733239439360000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..17.

FORMULA

a(3k+1)=(4k+2)! a(3k+2)=(4k+4)! a(3k+3)=(4k+5)!/2

CROSSREFS

Sequence in context: A079608 A257663 A292162 * A100918 A152965 A139284

Adjacent sequences:  A068875 A068876 A068877 * A068879 A068880 A068881

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Mar 29 2002

STATUS

approved

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Last modified October 23 14:06 EDT 2018. Contains 316528 sequences. (Running on oeis4.)