%I #14 Mar 20 2020 18:48:11
%S 1,-3,-43,2009,6313,-9872907,760322045,105243758801,-41122814903471,
%T 1873399639193325,3032918686052577317,-1060046322104258754871,
%U -196239553045718536023047,335369132729230015620066021
%N Expansion of tan(tanh(x)*cos(x)).
%t With[{nn=30},Take[CoefficientList[Series[Tan[Tanh[x]*Cos[x]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Mar 20 2020 *)
%K sign
%O 0,2
%A _R. H. Hardin_
%E Extended with signs by _Olivier GĂ©rard_, Mar 15 1997
%E Previous Mathematica program replaced by _Harvey P. Dale_, Mar 20 2020