A009403 - OEIS

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A009403

Expansion of ln(1+tanh(x)^2).

0, 2, -28, 992, -69088, 8110592, -1448424448, 366436769792, -124760831684608, 55014520738414592, -30501848618302701568, 20768078187214502100992, -17035983844637174375907328, 16570619538920401323784404992 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,2`
	LINKS	`Table of n, a(n) for n=0..13.`
	MATHEMATICA	`Log[ 1+Tanh[ x ]^2 ] (* Even Part *)`
	CROSSREFS	`Cf. A024299.` `Sequence in context: A009256 A012725 A012756 * A026944 A113633 A186491` `Adjacent sequences: A009400 A009401 A009402 * A009404 A009405 A009406`
	KEYWORD	`sign`
	AUTHOR	`R. H. Hardin`
	EXTENSIONS	`Extended with signs Mar 15 1997 by Olivier Gerard.`
	STATUS	`approved`

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Last modified May 25 11:16 EDT 2013. Contains 225647 sequences.