%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)