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A009275 Expansion of exp(tanh(x)/cosh(x)). 0
1, 1, 1, -4, -19, 12, 517, 1472, -18023, -159792, 587529, 16362304, 19183749, -1834702400, -12219870323, 218477736448, 3379214470193, -23399883425536, -883981857320943, 225490426670080, 238930492488456221 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

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

MATHEMATICA

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

CROSSREFS

Sequence in context: A012496 A024572 A009267 * A070612 A165820 A043056

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

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Last modified January 21 06:26 EST 2022. Contains 350473 sequences. (Running on oeis4.)