A012176 - OEIS

%I #7 Nov 21 2013 12:46:01

%S 1,5,129,7965,910785,168520725,46302986625,17780913886125,

%T 9118678334858625,6027946461936745125,4993688347647511370625,

%U 5067155718588449670088125,6180682927872411162068450625

%N arcsin(tan(arctanh(x)))=x+5/3!*x^3+129/5!*x^5+7965/7!*x^7+910785/9!*x^9...

%t With[{nn=30},Take[CoefficientList[Series[ArcSin[Tan[ArcTanh[x]]],{x,0,nn}], x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Nov 03 2011 *)

%K nonn

%O 0,2

%A Patrick Demichel (patrick.demichel(AT)hp.com)