id:A009817 - OEIS Search Results

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

+0
2

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

	OFFSET	`0,2`
	MATHEMATICA	`Tanh[ Tan[ x ]x ] ( Even Part *)`
	CROSSREFS	`Sequence in context: A140050 A154908 A166356 this_sequence A124105 A079613 A091299` `Adjacent sequences: A009814 A009815 A009816 this_sequence 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 December 2 11:54 EST 2009. Contains 167921 sequences.

AT&T Labs Research