A012382 - OEIS

%I #6 Nov 26 2022 17:13:09

%S 2,12,-50,-14280,-1068422,-30200060,10958392198,3463555073776,

%T 545166839566962,-49116089574216068,-83255760459250654530,

%U -37791627619282937372632,-5498203465858654403105814

%N tanh(tan(x)*arcsin(x))=2/2!*x^2+12/4!*x^4-50/6!*x^6-14280/8!*x^8...

%t With[{nn=30},Take[CoefficientList[Series[Tanh[Tan[x]ArcSin[x]],{x,0,nn}],x] Range[ 0,nn]!,{3,-1,2}]] (* _Harvey P. Dale_, Nov 26 2022 *)

%K sign

%O 0,1

%A Patrick Demichel (patrick.demichel(AT)hp.com)