A009399 - OEIS

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A009399

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

0, 2, -20, 576, -33312, 3258880, -485139456, 102300807168, -29028932390912, 10668077137133568, -4929291212351078400, 2797060130323340197888, -1912137417504544127975424, 1550018044651811766917922816 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	MATHEMATICA	`Log[ 1+Tanh[ x ]x ] ( Even Part *)`
	CROSSREFS	`Sequence in context: A009699 A101927 A157317 * A197743 A009182 A015207` `Adjacent sequences: A009396 A009397 A009398 * A009400 A009401 A009402`
	KEYWORD	`sign`
	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 14 20:38 EST 2012. Contains 205663 sequences.