A009138 - OEIS

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A009138

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

1, 0, 1, -3, 0, 0, 210, -1260, 3752, -46872, 690960, -6013920, 58389672, -895065600, 12888358392, -168411308520, 2621915506688, -47022586623488, 824126273574336, -14767693271763840, 293589445235224960 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	MATHEMATICA	`Cosh[ Log[ 1+x ]/Cosh[ x ] ]`
	CROSSREFS	`Sequence in context: A160537 A009133 A180515 * A175562 A111025 A098018` `Adjacent sequences: A009135 A009136 A009137 * A009139 A009140 A009141`
	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 14 17:06 EST 2012. Contains 205644 sequences.