A013147 - OEIS

%I #6 Jun 17 2015 15:38:20

%S 2,-12,488,-55552,12546944,-4711567872,2650074624000,

%T -2084720933010432,2185097305985613824,-2943182792681798926336,

%U 4953485656236312191369216,-10186669183126638973192372224

%N arcsinh(tanh(x)+arctan(x))=2*x-12/3!*x^3+488/5!*x^5-55552/7!*x^7...

%t With[{nn=30},Take[CoefficientList[Series[ArcSinh[Tanh[x]+ArcTan[x]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Jun 17 2015 *)

%K sign

%O 0,1

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