A012681 - OEIS

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A012681

cos(tanh(x)*arctan(x))=1-12/4!*x^4+480/6!*x^6-25200/8!*x^8...

1, 0, -12, 480, -25200, 1789440, -165502656, 18976409088, -2521802100480, 337469315481600, -20084172331338752, -21802197506685280256, 22192552544232587431936, -18125174754251391091998720 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A012687 A012467 A009083 * A009168 A012460 A012685` `Adjacent sequences: A012678 A012679 A012680 * A012682 A012683 A012684`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 15 17:46 EST 2012. Contains 205835 sequences.