A009073 - OEIS

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A009073

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

1, -2, 4, -128, 1296, -85600, 4372160, -148860416, 54261590272, 1474575037952, 1579094994228224, 145025202842173440, 87575771555229601792, 13290672132247757398016, 8077796113026531668901888 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	MATHEMATICA	`Cos[ Tan[ x ] ]/Cosh[ x ] (* Even Part *)`
	CROSSREFS	`Sequence in context: A018493 A046035 A134710 * A012561 A012558 A012617` `Adjacent sequences: A009070 A009071 A009072 * A009074 A009075 A009076`
	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 08:13 EST 2012. Contains 205893 sequences.