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%I #6 Apr 12 2013 18:24:10
%S 2,88,353952,4859875200,286589256061440,38349390501320693760,
%T 11520524205295446001950720,6360705742909296331970308177920
%N arcsinh(arctanh(x)*arctan(x))=2/2!*x^2+88/6!*x^6+353952/10!*x^10...
%t With[{nn=30},Take[CoefficientList[Series[ArcSinh[ArcTanh[x]ArcTan[x]],{x,0,nn}],x] Range[0,nn]!,{3,-1,4}]] (* _Harvey P. Dale_, Apr 12 2013 *)
%K nonn
%O 0,1
%A Patrick Demichel (patrick.demichel(AT)hp.com)
%E Definition clarified by _Harvey P. Dale_, Apr 12 2013