OFFSET
0,4
FORMULA
a(n) ~ n! * (-1)^(n+1) * sinh(1) / 2. - Vaclav Kotesovec, Jan 23 2015
MATHEMATICA
Sinh[ x ]*Cosh[ Log[ 1+x ] ]
CoefficientList[Series[((1 + (1 + x)^2)*Sinh[x])/(2*(1 + 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