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%I #6 Nov 22 2013 13:16:39
%S 1,1,1,49,1,83361,-2206335,961321425,-96313079295,41773143339585,
%T -9493597481579775,4967941000109596785,-1991874953215606007295,
%U 1319075774798596975837665,-807077677117010238256087935
%N cosh(arcsin(arcsinh(x)))=1+1/2!*x^2+1/4!*x^4+49/6!*x^6+1/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Cosh[ArcSin[ArcSinh[x]]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Nov 22 2013 *)
%K sign
%O 0,4
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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