A009187 Expansion of cosh(x)/exp(tanh(x)).

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

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

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved