A012728 - OEIS

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A012728

sin(arctanh(x)*arctan(x))=2/2!*x^2+88/6!*x^6+112032/10!*x^10...

2, 88, 112032, 339519360, -45065746337280, -13641523340876605440, -5909672857101969499054080, -4213934311138261721595771125760 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,1`
	LINKS	`Table of n, a(n) for n=0..7.`
	MATHEMATICA	`With[{nn=30}, Take[CoefficientList[Series[Sin[ArcTanh[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 4}]] ( Ray Chandler, Nov 28 2016 *)`
	CROSSREFS	`Sequence in context: A001904 A053950 A266182 * A012733 A058459 A355272` `Adjacent sequences: A012725 A012726 A012727 * A012729 A012730 A012731`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (patrick.demichel(AT)hp.com)`
	STATUS	`approved`

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Last modified March 20 22:57 EDT 2023. Contains 361392 sequences. (Running on oeis4.)