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%I #6 Sep 21 2015 17:11:03
%S 1,0,28,-728,54416,-5676352,900432960,-193766436992,55349093955840,
%T -20153308820338688,9138844606925237248,-5050190610067417167872,
%U 3343568694767924711428096,-2613638716122945595362951168
%N arcsinh(sec(x)*arctan(x))=x+28/5!*x^5-728/7!*x^7+54416/9!*x^9...
%t With[{nn=30},Take[CoefficientList[Series[ArcSinh[Sec[x]ArcTan[x]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Sep 21 2015 *)
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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