A009009 - OEIS

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A009009

Expansion of 1/cos(sinh(x)).

1, 1, 9, 177, 6545, 387649, 33646041, 4025701617, 635120351777, 127753094128897, 31911422805749673, 9691219439564235441, 3516474983468155702193, 1502487398886128051614273 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	MATHEMATICA	`1/Cos[ Sinh[ x ] ] (* Even Part *)`
	CROSSREFS	`Sequence in context: A157774 A193443 A003711 * A034221 A034240 A163132` `Adjacent sequences: A009006 A009007 A009008 * A009010 A009011 A009012`
	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 14 18:09 EST 2012. Contains 205663 sequences.