A012809 - OEIS

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A012809

tanh(sec(x)*arctan(x))=x-1/3!*x^3+25/5!*x^5-1209/7!*x^7+68945/9!*x^9...

1, -1, 25, -1209, 68945, -7692881, 1181481769, -242740782153, 66317255314721, -22739603323053601, 9634203397240829625, -4937246969845634306905, 3007627322996781467655025 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A112102 A012799 A120694 * A014769 A012851 A181719` `Adjacent sequences: A012806 A012807 A012808 * A012810 A012811 A012812`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 16 12:15 EST 2012. Contains 205909 sequences.