A009373 - OEIS

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A009373

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

0, 1, -1, 1, -8, 65, -361, 2497, -23848, 256385, -2904601, 36778113, -520366208, 8014148545, -132884846641, 2373343120449, -45463597872688, 928532354406145, -20134914035881681, 462226423647925505, -11199802803793004888 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	MATHEMATICA	`Log[ 1+Tan[ x ] ]/Cosh[ x ]`
	CROSSREFS	`Sequence in context: A067215 A202783 A067685 * A033118 A033126 A022039` `Adjacent sequences: A009370 A009371 A009372 * A009374 A009375 A009376`
	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 16 21:30 EST 2012. Contains 205971 sequences.