A009275 Expansion of exp(tanh(x)/cosh(x)).

1, 1, 1, -4, -19, 12, 517, 1472, -18023, -159792, 587529, 16362304, 19183749, -1834702400, -12219870323, 218477736448, 3379214470193, -23399883425536, -883981857320943, 225490426670080, 238930492488456221

Offset

0,4

Links

Table of n, a(n) for n=0..20.

Mathematica

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

Crossrefs

Sequence in context: A024572 A357818 A009267 * A362249 A070612 A165820

Adjacent sequences: A009272 A009273 A009274 * A009276 A009277 A009278

Keyword

sign,easy

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved