A009187 - OEIS

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A009187

Expansion of cosh(x)/exp(tanh(x)).

0

1, -1, 2, -2, 0, 8, 8, -184, 192, 5568, -20480, -231552, 1837696, 11751296, -187743488, -596164352, 22698672128, 4342886400, -3236847570944, 10035384119296, 536307107184640, -3825733461393408, -101121059849109504

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

LINKS

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

MATHEMATICA

Cosh[ x ]/Exp[ Tanh[ x ] ]

CROSSREFS

Sequence in context: A337710 A248948 A364288 * A009803 A009615 A184011

Adjacent sequences: A009184 A009185 A009186 * A009188 A009189 A009190

KEYWORD

sign,easy

AUTHOR

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved