A013109 - OEIS

%I #6 Jul 19 2014 18:16:11

%S 2,-11,441,-48897,10711449,-3898352493,2124846180765,

%T -1619764201737297,1645104402411921297,-2147066174256624128277,

%U 3501336873746919748187493,-6976563529004472877778185497

%N arcsinh(arcsinh(x)+arctan(x))=2*x-11/3!*x^3+441/5!*x^5-48897/7!*x^7...

%t With[{nn=30},Take[CoefficientList[Series[ArcSinh[ArcSinh[x]+ArcTan[x]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Jul 19 2014 *)

%K sign

%O 0,1

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