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A012189 arcsinh(arctan(sin(x)))=x-4/3!*x^3+84/5!*x^5-4488/7!*x^7+450768/9!*x^9... 0
1, -4, 84, -4488, 450768, -73573248, 17815591104, -6013430329728, 2703233646006528, -1562922378845445120, 1130630051482809369600, -1000815673354945580034048, 1064286361791704604763115520 (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[ArcSinh[ArcTan[Sin[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Apr 20 2013 *)

CROSSREFS

Sequence in context: A012037 A012025 A012107 * A012076 A173211 A109901

Adjacent sequences:  A012186 A012187 A012188 * A012190 A012191 A012192

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified October 16 12:35 EDT 2018. Contains 316263 sequences. (Running on oeis4.)