A012668 arcsin(tanh(x)*tan(x))=2/2!*x^2+232/6!*x^6+647072/10!*x^10...

2, 232, 647072, 11510902912, 730537735434752, 121024350517590894592, 43334092203148352120594432, 29569225337018517420748948406272, 35135401746397350937514453454595162112, 67930055172164174273112190776969951565053952

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