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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
OFFSET
0,2
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
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved