A009702 - OEIS

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A009702

Expansion of tan(tan(x))/cosh(x).

1, 1, 57, 1657, 136977, 14004945, 2219125001, 457176874377, 123849671844513, 41945147421378337, 17490738249607542873, 8778749876346904238105, 5226971507061600220653233, 3640737476966979742943568113 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	MATHEMATICA	`Tan[ Tan[ x ] ]/Cosh[ x ] (* Odd Part *)`
	CROSSREFS	`Sequence in context: A179466 A017773 A017720 * A011812 A022231 A012058` `Adjacent sequences: A009699 A009700 A009701 * A009703 A009704 A009705`
	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 17:13 EST 2012. Contains 205828 sequences.