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A012055 cos(sin(arctanh(x)))=1-1/2!*x^2-3/4!*x^4-21/6!*x^6+185/8!*x^8... 0
1, -1, -3, -21, 185, 67159, 11805621, 2380474563, 591392066161, 181472052075695, 68002767860495981, 30687549807072450459, 16452262725440109947177, 10350119384788050029211399 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Cos[Sin[ArcTanh[x]]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Jul 04 2017 *)

CROSSREFS

Sequence in context: A006199 A083063 A012163 * A344896 A059863 A256625

Adjacent sequences:  A012052 A012053 A012054 * A012056 A012057 A012058

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified November 27 04:53 EST 2021. Contains 349346 sequences. (Running on oeis4.)