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%I #6 Nov 28 2016 17:51:28
%S 1,-2,32,-1392,118400,-16678144,3517084672,-1037502889984,
%T 407811782836224,-205957880207835136,129921324821854289920,
%U -100089923129501690626048,92456928301505596639674368
%N arctanh(arctan(arctan(x)))=x-2/3!*x^3+32/5!*x^5-1392/7!*x^7+118400/9!*x^9...
%t With[{nn=30},Take[CoefficientList[Series[ArcTanh[ArcTan[ArcTan[x]]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Ray Chandler_, Nov 28 2016 *)
%K sign
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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