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A012170 arcsin(tan(tanh(x)))=x+1/3!*x^3+1/5!*x^5+169/7!*x^7+5857/9!*x^9... 0
1, 1, 1, 169, 5857, 365905, 48069217, 6592812217, 1367546003521, 352618786733473, 113088877092468289, 44682599178075094729, 21050259388599343979041, 11746444483256346415750897 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 25 01:10 EST 2021. Contains 340414 sequences. (Running on oeis4.)