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cosh(arcsinh(x)+arctan(x))=1+4/2!*x^2-8/4!*x^4+70/6!*x^6-920/8!*x^8...
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%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)