A009381 - OEIS

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A009381

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

0, 1, -1, 1, -2, 25, -136, 761, -4752, 42065, -386176, 3898321, -42551552, 521329705, -6816879616, 96017526281, -1446339889152, 23356125062945, -399659935891456, 7240133620964641, -138393644469911552, 2786977252450841785 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,5`
	LINKS	`Table of n, a(n) for n=0..21.`
	MATHEMATICA	`Log[ 1+Tan[ x ]/Cosh[ x ] ]`
	CROSSREFS	`Sequence in context: A175522 A196011 A080515 * A063264 A024533 A220276` `Adjacent sequences: A009378 A009379 A009380 * A009382 A009383 A009384`
	KEYWORD	`sign,easy`
	AUTHOR	`R. H. Hardin`
	EXTENSIONS	`Extended with signs Mar 15 1997 by Olivier Gerard.`
	STATUS	`approved`

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Last modified May 23 16:56 EDT 2013. Contains 225610 sequences.