A009720 - OEIS

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A009720

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

1, -3, -43, 2009, 6313, -9872907, 760322045, 105243758801, -41122814903471, 1873399639193325, 3032918686052577317, -1060046322104258754871, -196239553045718536023047, 335369132729230015620066021 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	MATHEMATICA	`Tan[ Tanh[ x ]Cos[ x ] ] ( Odd Part *)`
	CROSSREFS	`Sequence in context: A201784 A136648 A114337 * A201173 A190637 A076361` `Adjacent sequences: A009717 A009718 A009719 * A009721 A009722 A009723`
	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 15 12:59 EST 2012. Contains 205788 sequences.