OFFSET
0,5
FORMULA
a(n) ~ (-1)^(n/2+1) * 2 * sqrt(tan(1)) * n^(n-1) * exp(-n) / (sin(1))^n, if n is even and a(n) ~ (-1)^((n-1)/2) * 2 * n^(n-1)*exp(-n), if n is odd. - Vaclav Kotesovec, Oct 30 2013
MATHEMATICA
CoefficientList[Series[Exp[ArcSinh[ArcSinh[x]]], {x, 0, 20}], x]* Range[0, 20]! (* Vaclav Kotesovec, Oct 30 2013 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved