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A009356 Expansion of log(1+sinh(x))/exp(x). 5
0, 1, -3, 9, -32, 140, -757, 4963, -38376, 341664, -3438641, 38576747, -477118600, 6447914668, -94515392805, 1493405394411, -25300960235504, 457490990665952, -8793604786338049, 179039287811168755, -3849069823206873888 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..20.

FORMULA

a(n) ~ (n-1)! * (-1)^(n+1) * (1+sqrt(2)) / (log(1+sqrt(2)))^n. - Vaclav Kotesovec, Jan 23 2015

MATHEMATICA

Log[ 1+Sinh[ x ] ]/Exp[ x ]

CoefficientList[Series[Log[1 + Sinh[x]]/E^x, {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)

CROSSREFS

Sequence in context: A210689 A334642 A273596 * A341302 A297209 A058138

Adjacent sequences:  A009353 A009354 A009355 * A009357 A009358 A009359

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved

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Last modified September 17 19:06 EDT 2021. Contains 347489 sequences. (Running on oeis4.)