A009809 - OEIS

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A009809

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

1, -3, -3, 49, 2905, 83589, -334059, -351159815, -39776495567, -2339943411315, 181395497796525, 87834301596283969, 15443686178950893193, 532878946672338704661, -705534269899082168140347 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	MATHEMATICA	`Tanh[ Tan[ x ] ]Cos[ x ] ( Odd Part *)`
	CROSSREFS	`Sequence in context: A083391 A165636 A142469 * A100065 A066807 A165497` `Adjacent sequences: A009806 A009807 A009808 * A009810 A009811 A009812`
	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 16 14:37 EST 2012. Contains 205930 sequences.