A009400 - OEIS

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A009400

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

0, 1, -1, 3, -10, 65, -376, 2723, -22800, 226785, -2467456, 29857443, -397200640, 5785047905, -91090625536, 1544546456963, -28057896929280, 543833037679425, -11198060484591616, 244141035610073283, -5618437516698910720 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	MATHEMATICA	`Log[ 1+Tanh[ x ]/Cos[ x ] ]`
	CROSSREFS	`Sequence in context: A041014 A167939 A206724 * A004102 A072638 A080526` `Adjacent sequences: A009397 A009398 A009399 * A009401 A009402 A009403`
	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 23:58 EST 2012. Contains 206085 sequences.