A013508 - OEIS

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A013508

cos(sec(x)-sech(x))=1-12/4!*x^4-5152/8!*x^8-7351872/12!*x^12...

1, -12, -5152, -7351872, 23844355328, 2971598628507648, 259172055916070309888, 31874732857037574011240448, 5625494806370311291378460131328, 1331819025115560536529968068424368128, 357000031318983624394235069073760267010048, 30988128279193785865476747562711031784709029888 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	CROSSREFS	`Sequence in context: A009094 A061701 A134821 * A003793 A171669 A094268` `Adjacent sequences: A013505 A013506 A013507 * A013509 A013510 A013511`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`
	EXTENSIONS	`More terms from N. J. A. Sloane, Dec 17 2011`

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Last modified February 16 02:51 EST 2012. Contains 205860 sequences.