A009647 - OEIS

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A009647

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

0, 1, -1, 1, -12, 95, -615, 5003, -52192, 600029, -7464645, 102853749, -1558643724, 25565811531, -450966117147, 8528942156655, -172180452813600, 3693485934629625, -83891436038405865, 2011562464233339561 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	MATHEMATICA	`Tan[ Log[ 1+x ] ]/Cosh[ x ]`
	CROSSREFS	`Sequence in context: A057410 A045894 A045829 * A038836 A026860 A021074` `Adjacent sequences: A009644 A009645 A009646 * A009648 A009649 A009650`
	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 21:51 EST 2012. Contains 205978 sequences.