A009723 - OEIS

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A009723

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

1, 3, 57, 1995, 128881, 12775059, 1796958633, 342118793307, 84276974508769, 26141579246291235, 9956883572644073241, 4570240365824839488747, 2487549038143714062879313, 1584207614996350912703688627 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	MATHEMATICA	`Tan[ Tanh[ x ]/Cos[ x ] ] (* Odd Part *)`
	CROSSREFS	`Sequence in context: A157929 A053725 A053774 * A069992 A012196 A012090` `Adjacent sequences: A009720 A009721 A009722 * A009724 A009725 A009726`
	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 17 00:09 EST 2012. Contains 205978 sequences.