A012826 - OEIS

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A012826

cos(sec(x)*arcsinh(x))=1-1/2!*x^2-7/4!*x^4-145/6!*x^6-2063/8!*x^8...

1, -1, -7, -145, -2063, -128705, 5154217, -510686033, 254809389793, -27371394484993, 18728499608356185, -5038330344345849489, 3197858289863468529361, -1630641802209014177997505 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A104240 A156978 A163028 * A102059 A064624 A048935` `Adjacent sequences: A012823 A012824 A012825 * A012827 A012828 A012829`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 13 19:38 EST 2012. Contains 205536 sequences.