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A012175 sin(tan(arctanh(x)))=x+3/3!*x^3+41/5!*x^5+1019/7!*x^7+12305/9!*x^9... 0
1, 3, 41, 1019, 12305, -7478221, -3005647943, -1143787246421, -494108406644959, -250135591701350045, -148735005859748997559, -103273288933359010564517, -83050756624193183081902799 (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[Sin[Tan[ArcTanh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Feb 07 2015 *)

CROSSREFS

Sequence in context: A138961 A075022 A300281 * A007313 A222524 A241704

Adjacent sequences:  A012172 A012173 A012174 * A012176 A012177 A012178

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified October 18 23:39 EDT 2019. Contains 328211 sequences. (Running on oeis4.)