%I #14 May 17 2021 12:55:49
%S 0,2,-4,-42,-456,10154,1263668,74121726,1582556016,-396499390126,
%T -87145255604884,-10528569148387290,-379538283994219608,
%U 201132350259244110074,52827499211277672807332
%N Expansion of tanh(tan(x))*sin(x).
%t With[{nn=30},Take[CoefficientList[Series[Tanh[Tan[x]] Sin[x],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, May 17 2021 *)
%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_, May 17 2021