A009131 - OEIS

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A009131

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

1, 0, 0, -3, 11, -30, 194, -1785, 13957, -113148, 1143284, -13131855, 156950639, -2005222362, 28119703702, -424785970245, 6792043718345, -115135087505400, 2072993596779944, -39432571052652315, 788564865102950035 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	MATHEMATICA	`Cosh[ Log[ 1+x ] ]/Cosh[ x ]`
	CROSSREFS	`Sequence in context: A167375 A085376 A196233 * A003554 A003523 A018781` `Adjacent sequences: A009128 A009129 A009130 * A009132 A009133 A009134`
	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 15 17:13 EST 2012. Contains 205828 sequences.