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A009783 Expansion of tanh(log(1+x)*cos(x)). 0
0, 1, -1, -3, 12, 15, -375, 819, 13888, -108483, -551925, 13545961, -22418484, -1621656517, 14484838277, 186206989903, -4523278283040, -3719219044807, 1200472177117815, -10141780669451755, -290942811953148500 (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 ]*Cos[ x ] ]

CROSSREFS

Sequence in context: A001196 A096854 A013191 * A192786 A277738 A064106

Adjacent sequences:  A009780 A009781 A009782 * A009784 A009785 A009786

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 16 16:57 EDT 2018. Contains 316271 sequences. (Running on oeis4.)