id:A009011 - OEIS Search Results

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

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1, 1, -3, -3, 665, -25031, 607893, 13065717, -3684215119, 322746228337, -2173907680851, -5317484317809939, 1007358319257596489, 46704901267812186793, -111828938184578058229947 (list; graph; listen)

	OFFSET	`0,3`
	MATHEMATICA	`1/Cos[ Tanh[ x ] ] (* Even Part *)`
	CROSSREFS	`Sequence in context: A007301 A009715 A138662 this_sequence A009498 A076253 A081174` `Adjacent sequences: A009008 A009009 A009010 this_sequence A009012 A009013 A009014`
	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 December 16 17:18 EST 2009. Contains 170825 sequences.

AT&T Labs Research