A012831 - OEIS

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A012831

cosh(sec(x)*arcsinh(x))=1+1/2!*x^2+9/4!*x^4+225/6!*x^6+6993/8!*x^8...

1, 1, 9, 225, 6993, 467745, 29529753, 4297350785, 378759492257, 122599030798017, 8002975063348265, 9354851201922233249, -686072407102337430543, 1787263355638656126843105 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,3`
	LINKS	`Table of n, a(n) for n=0..13.`
	CROSSREFS	`Sequence in context: A067405 A063386 A063392 * A012749 A188662 A079727` `Adjacent sequences: A012828 A012829 A012830 * A012832 A012833 A012834`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (patrick.demichel(AT)hp.com)`
	STATUS	`approved`

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Last modified August 11 15:10 EDT 2022. Contains 356066 sequences. (Running on oeis4.)