A012734 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A012734

arctanh(arctanh(x)*arctan(x))=2/2!*x^2+448/6!*x^6+2380032/10!*x^10...

2, 448, 2380032, 69695846400, 6697099792220160, 1606188416621920911360, 810882197441673837894696960, 766865924510666637669136261447680 (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[ArcTanh[ArcTanh[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 4}]] ( Ray Chandler, Nov 28 2016 *)`
	CROSSREFS	`Sequence in context: A118710 A159513 A012730 * A099686 A066152 A112862` `Adjacent sequences: A012731 A012732 A012733 * A012735 A012736 A012737`
	KEYWORD	`nonn`
	AUTHOR	`Patrick Demichel (patrick.demichel(AT)hp.com)`
	STATUS	`approved`

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 23 10:58 EDT 2023. Contains 361443 sequences. (Running on oeis4.)