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%I
%S 1,1,1,4,13,84,469,4152,32985,370128,3818601,51861888,658371429,
%T 10494283968,158197312701,2894815734912,50529852678321,
%U 1043916757274880,20707179214389201,476720372375608320
%N Expansion of e.g.f.: exp(arctanh(arcsin(x)))=1+x+1/2!*x^2+4/3!*x^3+13/4!*x^4+84/5!*x^5...
%t With[{nn=20},CoefficientList[Series[Exp[ArcTanh[ArcSin[x]]],{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, May 29 2019 *)
%K nonn
%O 0,4
%A Patrick Demichel (patrick.demichel(AT)hp.com)
%E Definition clarified by _Harvey P. Dale_, May 29 2019
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