A012168 - OEIS

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A012168

sec(tan(arcsinh(x)))=1+1/2!*x^2+9/4!*x^4+201/6!*x^6+7921/8!*x^8...

1, 1, 9, 201, 7921, 524081, 48396345, 6493605561, 1082018699105, 246352273609441, 64161902428428265, 22422522791742857001, 8300517886009938036049, 4196071192877342442444561 (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: A093708 A052145 A012061 * A012133 A012038 A012108` `Adjacent sequences: A012165 A012166 A012167 * A012169 A012170 A012171`
	KEYWORD	`nonn`
	AUTHOR	`Patrick Demichel (patrick.demichel(AT)hp.com)`
	STATUS	`approved`

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Last modified May 25 21:30 EDT 2013. Contains 225649 sequences.