A012729 - OEIS

%I #6 Nov 28 2016 20:03:25

%S 2,328,1402272,34476662400,2862572968849920,606547177566513039360,

%T 275433333396552433711226880,237761902453820639998996848476160

%N arcsin(arctanh(x)*arctan(x))=2/2!*x^2+328/6!*x^6+1402272/10!*x^10...

%t With[{nn=30},Take[CoefficientList[Series[ArcSin[ArcTanh[x]*ArcTan[x]],{x,0,nn}],x] Range[0,nn]!,{3,-1,4}]] (* _Ray Chandler_, Nov 28 2016 *)

%K nonn

%O 0,1

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