A012562 - OEIS

%I #12 Nov 28 2016 19:47:32

%S 0,2,-4,350,-11240,1703578,-193890860,49492653366,-12321392081232,

%T 4919573673167538,-2124948350723616724,1246509899975408733326,

%U -820629733751515166342200,671843179144303883329974346,-622270861646882104886119580924

%N arctanh(sinh(x)*arctan(x)) = 2/2!*x^2 - 4/4!*x^4 + 350/6!*x^6 - 11240/8!*x^8 + ...

%t With[{nn=30},Take[CoefficientList[Series[ArcTanh[Sinh[x]ArcTan[x]],{x,0,nn}],x]Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Nov 16 2012 *)

%K sign

%O 0,2

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