A009126 - OEIS

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A009126

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

1, 0, 1, -3, 4, 0, 16, -168, 64, 3840, 256, -177408, 1024, 11182080, 4096, -951886848, 16384, 104932638720, 65536, -14544442687488, 262144, 2475749026037760, 1048576, -507711943255523328, 4194304, 123460740095095603200, 16777216 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	MATHEMATICA	`Cosh[ Log[ 1+Tanh[ x ] ] ]`
	CROSSREFS	`Sequence in context: A099447 A078067 A192442 * A102222 A171657 A084301` `Adjacent sequences: A009123 A009124 A009125 * A009127 A009128 A009129`
	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 02:50 EST 2012. Contains 205694 sequences.