A012621 - OEIS

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A012621

sech(arcsinh(x)*tan(x))=1-12/4!*x^4-120/6!*x^6+1680/8!*x^8...

1, 0, -12, -120, 1680, 367680, 12095424, -560956032, -447394871040, -8068784621568, -1294533276204032, 6639186363172284416, -1043706052752056152064, 641443809049086939217920 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A120585 A200163 A012565 * A102341 A174561 A009078` `Adjacent sequences: A012618 A012619 A012620 * A012622 A012623 A012624`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 16 16:51 EST 2012. Contains 205938 sequences.