A012170 arcsin(tan(tanh(x)))=x+1/3!*x^3+1/5!*x^5+169/7!*x^7+5857/9!*x^9...

1, 1, 1, 169, 5857, 365905, 48069217, 6592812217, 1367546003521, 352618786733473, 113088877092468289, 44682599178075094729, 21050259388599343979041, 11746444483256346415750897

Offset

0,4

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[ArcSin[Tan[Tanh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -2, 2}]] (* Harvey P. Dale, Sep 24 2016 *)

Crossrefs

Sequence in context: A232313 A133583 A189277 * A264269 A264087 A163023

Adjacent sequences: A012167 A012168 A012169 * A012171 A012172 A012173

Keyword

nonn

Author

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

Status

approved