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%I #7 Dec 14 2020 15:13:41
%S 2,-152,227232,-795112320,44292972802560,2002112058391603200,
%T 937365267083373473341440,444372302749315420373243166720
%N tanh(arcsinh(x)*arcsin(x))=2/2!*x^2-152/6!*x^6+227232/10!*x^10...
%t With[{nn=30},Take[CoefficientList[Series[Tanh[ArcSinh[x]ArcSin[x]],{x,0,nn}],x] Range[ 0,nn]!,{3,-1,4}]] (* _Harvey P. Dale_, Dec 14 2020 *)
%K sign
%O 0,1
%A Patrick Demichel (patrick.demichel(AT)hp.com)