A024303 - OEIS

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A024303

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

0, 1, 0, -24, 448, -640, -658944, 56992768, -2831024128, -86998155264, 51519425740800, -9075812362878976, 917148920337924096, 26667007293767286784, -33058738844745936666624 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	MATHEMATICA	`Tan[ Tanh[ x ] ]x/2 ( Even Part *)`
	CROSSREFS	`A009718.` `Sequence in context: A004358 A006260 A187625 * A060195 A114201 A200979` `Adjacent sequences: A024300 A024301 A024302 * A024304 A024305 A024306`
	KEYWORD	`sign`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net)`
	EXTENSIONS	`Extended with signs 03/97.`

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Last modified February 15 20:26 EST 2012. Contains 205852 sequences.