A009773 - OEIS

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A009773

Expansion of tanh(ln(1+tan(x))).

0, 1, -1, 2, -2, -14, 194, -1828, 15688, -130664, 1037864, -7421008, 36772528, 153779536, -9259356016, 209102239712, -3831278863232, 63200892286336, -954398377549696, 12766540334296832, -131022499047886592 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	MATHEMATICA	`Tanh[ Log[ 1+Tan[ x ] ] ]`
	CROSSREFS	`Sequence in context: A194689 A166114 A202730 * A185044 A185244 A006929` `Adjacent sequences: A009770 A009771 A009772 * A009774 A009775 A009776`
	KEYWORD	`sign,easy`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net)`
	EXTENSIONS	`Extended with signs Mar 15 1997 by Olivier Gerard.`

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Last modified February 13 18:14 EST 2012. Contains 205534 sequences.