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A012204 arcsin(arctan(arctan(x)))=x-3/3!*x^3+57/5!*x^5-2755/7!*x^7+251601/9!*x^9... 0
1, -3, 57, -2755, 251601, -37281923, 8163849353, -2479580033411, 997801392400929, -513852593272870403, 329599574990913085529, -257652341842242812773955, 241116753509976748759134193 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[ArcSin[ArcTan[ArcTan[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Ray Chandler, Nov 28 2016 *)

CROSSREFS

Sequence in context: A210674 A281184 A012064 * A000281 A316664 A086220

Adjacent sequences:  A012201 A012202 A012203 * A012205 A012206 A012207

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified December 5 12:24 EST 2021. Contains 349557 sequences. (Running on oeis4.)