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A009126 Expansion of cosh(ln(1+tanh(x))). +0
1
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; listen)
OFFSET

0,4

MATHEMATICA

Cosh[ Log[ 1+Tanh[ x ] ] ]

CROSSREFS

Sequence in context: A113035 A099447 A078067 this_sequence A102222 A084301 A058022

Adjacent sequences: A009123 A009124 A009125 this_sequence 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 November 25 20:09 EST 2009. Contains 167514 sequences.


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