%I #6 Nov 27 2012 09:03:04
%S 1,4,-8,70,-920,-28550,10642900,-2554095050,685535422000,
%T -219648785612750,84602550046787500,-38917136125065331250,
%U 21166653214210218325000,-13470291608750677967093750
%N cosh(arcsinh(x)+arctan(x))=1+4/2!*x^2-8/4!*x^4+70/6!*x^6-920/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Cosh[ArcSinh[x]+ArcTan[x]],{x,0,nn}],x]Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Nov 27 2012 *)
%K sign
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)