A009401 - OEIS

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A009401

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

0, 1, -1, -3, 14, -15, -136, 1197, -5776, -255, 420224, -5448003, 30166784, 241437105, -8354415616, 104019879597, -291139373056, -17849464279935, 456381834297344, -5108933510880003, -26967886768439296, 2525823613297136625 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	MATHEMATICA	`Log[ 1+Tanh[ x ]/Cosh[ x ] ]`
	CROSSREFS	`Sequence in context: A034120 A037244 A016062 * A195864 A022890 A032920` `Adjacent sequences: A009398 A009399 A009400 * A009402 A009403 A009404`
	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 17 04:58 EST 2012. Contains 205985 sequences.