A009817 - OEIS

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A009817

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

0, 2, 8, -144, -11264, -323840, 36347904, 8388294656, 620426657792, -168731721990144, -79627879039631360, -11099857853570613248, 5627175549005859913728, 4469405304978356270268416 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	MATHEMATICA	`Tanh[ Tan[ x ]x ] ( Even Part *)`
	CROSSREFS	`Sequence in context: A140050 A154908 A166356 * A124105 A079613 A091299` `Adjacent sequences: A009814 A009815 A009816 * A009818 A009819 A009820`
	KEYWORD	`sign`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net)`
	EXTENSIONS	`Extended with signs Mar 15 1997 by Olivier Gerard.`

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Last modified February 17 02:31 EST 2012. Contains 205978 sequences.