OFFSET
0,4
FORMULA
E.g.f.: (x+sqrt(1+x^2))^(cosh(x)). - Vaclav Kotesovec, Nov 01 2013
a(n) ~ 2*cos(1) * sin(Pi/2*(n-cos(1))) * n^(n-1) / exp(n). - Vaclav Kotesovec, Nov 01 2013
MATHEMATICA
CoefficientList[Series[Exp[Cosh[x]*ArcSinh[x]], {x, 0, 20}], x]* Range[0, 20]! (* Vaclav Kotesovec, Nov 01 2013 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved