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arctan(arcsinh(x)+arctan(x))=2*x-19/3!*x^3+1041/5!*x^5-141489/7!*x^7...
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%I #6 Nov 29 2016 08:30:28

%S 2,-19,1041,-141489,35842401,-14587836921,8707393003617,

%T -7166002987401489,7776862795242656577,-10760731866324884664297,

%U 18490186709158886988610113,-38627726709262739118225523137

%N arctan(arcsinh(x)+arctan(x))=2*x-19/3!*x^3+1041/5!*x^5-141489/7!*x^7...

%t With[{nn=30},Take[CoefficientList[Series[ArcTan[ArcSinh[x]+ArcTan[x]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Ray Chandler_, Nov 29 2016 *)

%K sign

%O 0,1

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