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A009351 Expansion of log(1+sinh(x))*cos(x). 0
0, 1, -1, 0, -4, 20, -121, 896, -7344, 68304, -711721, 8200192, -103603204, 1424807488, -21191898001, 339004274688, -5804468899584, 105924311382272, -2052443682726961, 42085719065821184, -910506730330968484 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

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

FORMULA

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

MATHEMATICA

Log[ 1+Sinh[ x ] ]*Cos[ x ]

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

CROSSREFS

Sequence in context: A304069 A020028 A020118 * A121553 A067116 A067121

Adjacent sequences:  A009348 A009349 A009350 * A009352 A009353 A009354

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 March 26 01:08 EDT 2019. Contains 321479 sequences. (Running on oeis4.)