OFFSET
0,4
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..440
FORMULA
a(n) ~ n! * (-1)^(n+1) * exp(1/4 + sqrt(2*n)) / (2^(9/4) * n^(3/4) * sqrt(Pi)). - Vaclav Kotesovec, Jan 24 2015
MATHEMATICA
Sinh[ Sinh[ Log[ 1+x ] ] ]
CoefficientList[Series[Sinh[(x*(2 + x))/(2*(1 + x))], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 24 2015 *)
PROG
(PARI) x='x+O('x^50); concat([0], Vec(serlaplace(sinh(sinh(log(1+x)))))) \\ G. C. Greubel, Apr 11 2017
CROSSREFS
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved