A013412 - OEIS

%I #6 Apr 27 2016 16:19:30

%S 3,-15,945,-36855,5145525,-541215675,137450538225,-28334434503375,

%T 11334312919054125,-3890960916187219875,2248877246697095639625,

%U -1162888838017333636584375,916442062457996554007653125

%N arcsinh(arcsin(x)-arctan(x))=3/3!*x^3-15/5!*x^5+945/7!*x^7-36855/9!*x^9...

%t With[{nn=30},Take[CoefficientList[Series[ArcSinh[ArcSin[x]-ArcTan[x]],{x,0,nn}],x] Range[0,nn-1]!,{4,-1,2}]] (* _Harvey P. Dale_, Apr 27 2016 *)

%K sign

%O 0,1

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