OFFSET
0,2
FORMULA
a(n) ~ 2 * (2*n-1)! * (4*n)^(sinh(1)/2) / GAMMA(sinh(1)/2). - Vaclav Kotesovec, Oct 24 2013
MATHEMATICA
Table[n!*SeriesCoefficient[Exp[ArcTanh[x]*Sinh[x]], {x, 0, n}], {n, 0, 40, 2}] (* Vaclav Kotesovec, Oct 24 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved