login
tanh(sinh(x)*tan(x)) = 2/2!*x^2 + 12/4!*x^4 - 98/6!*x^6 - 16968/8!*x^8 - ...
2

%I #26 Apr 05 2017 07:54:09

%S 0,2,12,-98,-16968,-1022758,13538052,18891204022,3769346994672,

%T 123100068974642,-253651389915077508,-122777845265771787698,

%U -18798053944871656928088,18504747132976573022229002

%N tanh(sinh(x)*tan(x)) = 2/2!*x^2 + 12/4!*x^4 - 98/6!*x^6 - 16968/8!*x^8 - ...

%t With[{nn=30},Take[CoefficientList[Series[Tanh[Tan[x]*Sinh[x]],{x,0,nn}], x]Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Mar 26 2012 *)

%K sign

%O 0,2

%A _R. H. Hardin_

%E Extended with signs by _Olivier GĂ©rard_, Mar 15 1997