id:A009013 - OEIS Search Results

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Expansion of 1/(cosh(x)*cos(x)).

+0
2

1, 4, 1104, 2154304, 15456463104, 295213107733504, 12366226074019221504, 998143138923599406383104, 141496025961835234723147874304, 32857017298796399667445911477551104 (list; graph; listen)

	OFFSET	`0,2`
	MATHEMATICA	`1/(Cosh[ x ]Cos[ x ]) ( [ x^(4n) ] *)`
	CROSSREFS	`Adjacent sequences: A009010 A009011 A009012 this_sequence A009014 A009015 A009016` `Sequence in context: A139300 A004804 A110499 this_sequence A079711 A036107 A030271`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhh(AT)cadence.com)`
	EXTENSIONS	`Extended and signs tested Mar 15 1997 by Olivier Gerard.`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

AT&T Labs Research