A009266 Expansion of exp(tanh(x))/exp(x).

1, 0, 0, -2, 0, 16, 40, -272, -1792, 5696, 97536, -58112, -6692224, -14752256, 566971392, 3293370624, -57170149376, -629890867200, 6512209063936, 128178697854976, -759960372641792, -28999010130804736, 64032469498658816

Offset

0,4

Links

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

Mathematica

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

Crossrefs

Sequence in context: A371893 A015154 A346119 * A009246 A358629 A338448

Adjacent sequences: A009263 A009264 A009265 * A009267 A009268 A009269

Keyword

sign,easy

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved