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A009842 Expansion of tanh(x)/cosh(ln(1+x)). 0
0, 1, 0, -5, 12, 6, -120, 442, -2352, 13192, 53280, -1665432, 12223200, -6629648, -706340544, 9387463888, -95898673920, 563447710848, 8308014488064, -283290718941056, 3505513923832320, -9173243369732864, -499029405102412800 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..22.

MATHEMATICA

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

CROSSREFS

Sequence in context: A022835 A022834 A046610 * A169729 A070368 A066326

Adjacent sequences:  A009839 A009840 A009841 * A009843 A009844 A009845

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs Mar 15 1997 by Olivier Gérard.

STATUS

approved

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Last modified April 21 08:49 EDT 2014. Contains 240824 sequences.