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A009629
Expansion of sinh(x)/cos(log(1+x)).
0
0, 1, 0, 4, -12, 91, -660, 5902, -59528, 677353, -8557560, 118927656, -1802780100, 29602064259, -523414634652, 9915150539946, -200333301044880, 4300435439719377, -97740817953852528, 2344794532033126188
OFFSET
0,4
FORMULA
a(n) ~ n! * (-1)^(n+1) * sinh(1-exp(-Pi/2)) / ((exp(Pi/2)-1) * (1-exp(-Pi/2))^n). - Vaclav Kotesovec, Jan 23 2015
MATHEMATICA
Sinh[ x ]/Cos[ Log[ 1+x ] ]
CoefficientList[Series[Sec[Log[1 + x]]*Sinh[x], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)
CROSSREFS
Sequence in context: A203379 A209031 A096424 * A203110 A197919 A358003
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved