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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, 1, 4, 13, 84, 469, 4208, 33433, 386064, 3984681, 56523072, 718210725, 12121690944, 183013440765, 3589856932608, 62801454477105, 1406019035808000, 27970921286867025, 704535958463063040 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..19.

MATHEMATICA

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

CROSSREFS

Sequence in context: A197752 A241905 A012258 * A088946 A131590 A281182

Adjacent sequences:  A012131 A012132 A012133 * A012135 A012136 A012137

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified December 8 05:26 EST 2021. Contains 349590 sequences. (Running on oeis4.)