A009774 - OEIS

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A009774

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

0, 1, -1, -2, 14, -14, -286, 1828, 3464, -130664, 619304, 7421008, -128214736, 153779536, 18052524944, -209102239712, -1370716606336, 63200892286336, -414519986847616, -12766540334296832, 303340786629265664 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	MATHEMATICA	`Tanh[ Log[ 1+Tanh[ x ] ] ]`
	CROSSREFS	`Sequence in context: A174706 A072163 A084674 * A032933 A194230 A109993` `Adjacent sequences: A009771 A009772 A009773 * A009775 A009776 A009777`
	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 15 04:23 EST 2012. Contains 205694 sequences.