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A009647 Expansion of tan(ln(1+x))/cosh(x). 0
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.