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A009393 Expansion of log(1+tanh(x))/exp(x). 6
0, 1, -3, 6, -8, 5, -7, 70, -72, -1311, 1309, 49214, -49216, -2653547, 2653545, 196707438, -196707440, -19194804703, 19194804701, 2385684870742, -2385684870744, -367985503366779, 367985503366777, 68980888889771126, -68980888889771128 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..24.

MATHEMATICA

Log[ 1+Tanh[ x ] ]/Exp[ x ]

CROSSREFS

Sequence in context: A232717 A340794 A345204 * A077857 A181165 A181906

Adjacent sequences:  A009390 A009391 A009392 * A009394 A009395 A009396

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 October 17 13:57 EDT 2021. Contains 348049 sequences. (Running on oeis4.)