OFFSET
0,2
FORMULA
a(n) ~ 2*exp(tanh(1)) * n^n/exp(n) = 2*exp((exp(2)-1)/(exp(2)+1)) * n^n/exp(n). - Vaclav Kotesovec, Oct 24 2013
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Exp[ArcTanh[x]+Tanh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jul 24 2011 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved