OFFSET
0,4
LINKS
Robert Israel, Table of n, a(n) for n = 0..441
FORMULA
a(n) ~ (n-1)! * (-1)^(n+1) / (cos(log(1+sqrt(2))) * (log(1+sqrt(2)))^n). - Vaclav Kotesovec, Jan 23 2015
MAPLE
S:= series(log(1+sinh(x))/cos(x), x, 61):
seq(coeff(S, x, j)*j!, j=0..60); # Robert Israel, Jan 04 2019
MATHEMATICA
Log[ 1+Sinh[ x ] ]/Cos[ x ]
CoefficientList[Series[Log[1 + Sinh[x]]*Sec[x], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved