OFFSET
0,4
FORMULA
a(n) ~ (2*sin(1-n*Pi/2) * cos(Pi*cos(1)/2) * sinh(Pi*sin(1)/2) - 2*cos(1-n*Pi/2) * cosh(Pi*sin(1)/2) * sin(Pi*cos(1)/2)) * n^(n-1) / exp(n). - Vaclav Kotesovec, Oct 31 2013
MATHEMATICA
CoefficientList[Series[Cosh[ArcSinh[x]*Exp[x]], {x, 0, 20}], x]* Range[0, 20]! (* Vaclav Kotesovec, Oct 31 2013 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved