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A009787 Expansion of tanh(log(1+x)/cosh(x)). 0
0, 1, -1, -3, 12, 35, -435, -161, 23968, -68811, -1874205, 15189361, 177102156, -3209424153, -15134777567, 750725838563, -828777844320, -197682938738071, 1577204564247783, 55820827940141285, -1005440186803008980 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

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

MATHEMATICA

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

CROSSREFS

Sequence in context: A320346 A305542 A232899 * A135190 A101069 A225259

Adjacent sequences:  A009784 A009785 A009786 * A009788 A009789 A009790

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 19 00:03 EST 2021. Contains 340262 sequences. (Running on oeis4.)