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%I #6 Jul 07 2019 10:53:26
%S 1,2,4,8,16,72,544,3040,11008,64896,1060224,10595840,38065152,
%T 87854080,9708670976,170663275520,276991311872,-13108265091072,
%U 283899182678016,9548887177330688,-9456062364418048
%N Expansion of e.g.f.: exp(arctan(x)+tan(x))=1+2*x+4/2!*x^2+8/3!*x^3+16/4!*x^4+72/5!*x^5...
%t With[{nn=20},CoefficientList[Series[Exp[ArcTan[x]+Tan[x]],{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, Jul 07 2019 *)
%K sign
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)
%E Definition clarified by _Harvey P. Dale_, Jul 07 2019
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