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%I #6 Jul 09 2021 13:56:47
%S 1,1,5,61,937,-34919,-13257619,-3269873515,-890367567919,
%T -286428853272143,-109915623105978539,-50081947723080008339,
%U -26861824093922170259335,-16800404374717805427318199
%N cosh(sin(arctanh(x)))=1+1/2!*x^2+5/4!*x^4+61/6!*x^6+937/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Cosh[Sin[ArcTanh[x]]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Jul 09 2021 *)
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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