%I #6 Mar 06 2023 17:40:45
%S 2,-16,786,-95184,21536802,-7826481936,4171610593458,
%T -3065657686804944,2970875779254468162,-3670749245446679143440,
%U 5632318074161153772233298,-10506981374857963835979345360
%N arctan(arcsinh(x)+arcsin(x))=2*x-16/3!*x^3+786/5!*x^5-95184/7!*x^7...
%t With[{nn=30},Take[CoefficientList[Series[ArcTan[ArcSinh[x]+ArcSin[x]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Mar 06 2023 *)
%K sign
%O 0,1
%A Patrick Demichel (patrick.demichel(AT)hp.com)