A012852 - OEIS

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A012852

sech(sec(x)*arctanh(x))=1-1/2!*x^2-15/4!*x^4-225/6!*x^6+3297/8!*x^8...

1, -1, -15, -225, 3297, 973695, 99434577, 3364479391, -1767300967487, -640573924497921, -102867079807004495, 22939113754550703391, 27513402069157221548193, 11830594343212717024871295 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A171320 A078364 A207423 * A171289 A189906 A189900` `Adjacent sequences: A012849 A012850 A012851 * A012853 A012854 A012855`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.