A012833 - OEIS

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A012833

sech(sec(x)*arcsinh(x))=1-1/2!*x^2-3/4!*x^4-45/6!*x^6+2457/8!*x^8...

1, -1, -3, -45, 2457, -36825, 12566037, -1732392389, 313988548273, -92368244011185, 30231378922437805, -12317648529216417629, 6168347852710380187977, -3616136826996686827399305 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A154242 A163002 A117253 * A012747 A027637 A099168` `Adjacent sequences: A012830 A012831 A012832 * A012834 A012835 A012836`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 17 16:49 EST 2012. Contains 206058 sequences.