A012684 - OEIS

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A012684

tanh(tanh(x)*arctan(x))=2/2!*x^2-16/4!*x^4+80/6!*x^6+14464/8!*x^8...

2, -16, 80, 14464, -1924352, 182456320, -4821633024, -5022496751616, 2274499602284544, -641508042469015552, 58440162971714846720, 91048038738283980652544, -93320295604487977397387264 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	CROSSREFS	`Sequence in context: A197992 A045905 A012680 * A053587 A052346 A207263` `Adjacent sequences: A012681 A012682 A012683 * A012685 A012686 A012687`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.