%I #6 Jun 07 2022 17:12:23

%S 2,-12,-50,14280,-826502,-49633540,25407386758,-3395749736176,

%T -840874377633678,669385496489774468,-130679263245845309250,

%U -109382532060795384014888,114810087622932492884439786

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

%t With[{nn=30},Take[CoefficientList[Series[ArcTan[Tanh[x]ArcSinh[x]],{x,0,nn}],x] Range[ 0,nn]!,{3,-1,2}]] (* _Harvey P. Dale_, Jun 07 2022 *)

%K sign

%O 0,1

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