A012701 - OEIS

%I #6 Nov 28 2016 19:53:04

%S 0,0,2,-3,16,-50,128,756,-20064,298656,-3561408,38990160,-310756800,

%T 467943840,66887172480,-2183463747360,51505489029120,

%U -1001091175633920,15963926463621120,-153477175865587200

%N arctan(arctanh(x)*log(x+1))=2/2!*x^2-3/3!*x^3+16/4!*x^4-50/5!*x^5...

%t With[{nn=30},CoefficientList[Series[ArcTan[ArcTanh[x]*Log[x+1]],{x,0,nn}],x] Range[0,nn]!] (* _Ray Chandler_, Nov 28 2016 *)

%K sign

%O 0,3

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