A012811 - OEIS

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A012811

cosh(sec(x)*arctan(x))=1+1/2!*x^2+5/4!*x^4+205/6!*x^6+2473/8!*x^8...

1, 1, 5, 205, 2473, 475385, -2814227, 5900398725, -532397600303, 273302104270705, -68724093821987755, 35776180280496600509, -16339748046588020242311, 10552119508350355540652905 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A137736 A157389 A128678 * A186722 A060486 A002438` `Adjacent sequences: A012808 A012809 A012810 * A012812 A012813 A012814`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 17 04:26 EST 2012. Contains 205978 sequences.