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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
OFFSET
0,3
MATHEMATICA
Cosh[ x ]/Exp[ Tanh[ x ] ]
CROSSREFS
Sequence in context: A337710 A248948 A364288 * A009803 A009615 A184011
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved