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A012668 arcsin(tanh(x)*tan(x))=2/2!*x^2+232/6!*x^6+647072/10!*x^10... 0
2, 232, 647072, 11510902912, 730537735434752, 121024350517590894592, 43334092203148352120594432, 29569225337018517420748948406272, 35135401746397350937514453454595162112, 67930055172164174273112190776969951565053952 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..9.

MATHEMATICA

With[{nn=60}, Take[CoefficientList[Series[ArcSin[Tanh[x]Tan[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 4}]] (* Harvey P. Dale, Sep 21 2018 *)

CROSSREFS

Sequence in context: A261493 A012671 A012526 * A012530 A057157 A139963

Adjacent sequences: A012665 A012666 A012667 * A012669 A012670 A012671

KEYWORD

nonn

AUTHOR

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

EXTENSIONS

More terms from Harvey P. Dale, Sep 21 2018

STATUS

approved

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Last modified January 29 02:42 EST 2023. Contains 359915 sequences. (Running on oeis4.)