A012508 - OEIS

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A012508

sech(cos(x)*arctan(x))=1-1/2!*x^2+25/4!*x^4-1105/6!*x^6+91313/8!*x^8...

1, -1, 25, -1105, 91313, -12232385, 2400320393, -649247356433, 231544408317537, -105271075840787713, 59429582363323624185, -40787189186519841731153, 33444147237661076070865681 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A193121 A066852 A123204 * A112102 A012799 A120694` `Adjacent sequences: A012505 A012506 A012507 * A012509 A012510 A012511`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 16 13:30 EST 2012. Contains 205909 sequences.