A009812 - OEIS

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A009812

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

0, 2, 8, 48, 384, 18944, 2364416, 271337472, 29986947072, 3404290850816, 424605895884800, 64805172535099392, 13431502292801028096, 3690128527895627300864, 1195824827744772864081920 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	MATHEMATICA	`Tanh[ Tan[ x ] ]Tan[ x ] ( Even Part *)`
	CROSSREFS	`Sequence in context: A124453 A000165 A109664 * A063075 A177386 A112541` `Adjacent sequences: A009809 A009810 A009811 * A009813 A009814 A009815`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net)`
	EXTENSIONS	`Extended and signs tested Mar 15 1997 by Olivier Gerard.`

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Last modified February 15 03:33 EST 2012. Contains 205694 sequences.