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A012141 tanh(arcsin(arctanh(x)))=x+1/3!*x^3+9/5!*x^5+281/7!*x^7+20913/9!*x^9... 0
1, 1, 9, 281, 20913, 2869329, 613734393, 185272366761, 74333015297505, 38107181118565665, 24270343990842570345, 18795056467624757017785, 17394205995630055629900945, 18964089582659357000823035505 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Tanh[ArcSin[ArcTanh[x]]], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Feb 02 2012 *)

CROSSREFS

Sequence in context: A336259 A177107 A012234 * A328123 A110553 A330360

Adjacent sequences:  A012138 A012139 A012140 * A012142 A012143 A012144

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified September 19 04:50 EDT 2020. Contains 337175 sequences. (Running on oeis4.)