A024280 - OEIS

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A024280

Expansion of tanh(tan(x)^2)/2.

0, 1, 8, 16, -9472, -1073024, -73802752, 6179501056, 4687080685568, 1381417658515456, 171579748064165888, -115606987957684404224, -118208590165253073928192, -59168959906143078642089984 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	MATHEMATICA	`Tanh[ Tan[ x ]^2 ]/2 (* Even Part *)`
	CROSSREFS	`A009819.` `Sequence in context: A132377 A061747 A109585 * A115434 A024107 A066554` `Adjacent sequences: A024277 A024278 A024279 * A024281 A024282 A024283`
	KEYWORD	`sign`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net)`
	EXTENSIONS	`Extended with signs 03/97.`

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Last modified February 16 03:44 EST 2012. Contains 205860 sequences.