A012134 exp(arcsin(arctanh(x)))=1+x+1/2!*x^2+4/3!*x^3+13/4!*x^4+84/5!*x^5...

1, 1, 1, 4, 13, 84, 469, 4208, 33433, 386064, 3984681, 56523072, 718210725, 12121690944, 183013440765, 3589856932608, 62801454477105, 1406019035808000, 27970921286867025, 704535958463063040

Offset: 0

Author

Patrick Demichel (patrick.demichel(AT)hp.com)

Keywords

• nonn

Programs

Mathematica

With[{nn=20},CoefficientList[Series[Exp[ArcSin[ArcTanh[x]]],{x,0,nn}], x] Range[0,nn]!] (* Harvey P. Dale, Oct 08 2011 *)