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A012739 sin(arctanh(x)*cos(x))=x-2/3!*x^3+20/5!*x^5-16/7!*x^7+14096/9!*x^9... 0
1, -2, 20, -16, 14096, 887456, 126998976, 21834514688, 5067177011456, 1485621376751104, 540527763829711872, 238770291840873000960, 125924968135743519723520, 78156500138405011699867648 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Sin[ArcTanh[x]Cos[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Nov 04 2015 *)

CROSSREFS

Sequence in context: A083297 A343927 A221921 * A261753 A075031 A273466

Adjacent sequences:  A012736 A012737 A012738 * A012740 A012741 A012742

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified August 3 22:03 EDT 2021. Contains 346441 sequences. (Running on oeis4.)