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A009342 Expansion of log(1+sin(x)/cosh(x)). 1
0, 1, -1, -2, 10, -20, -16, 488, -4080, 22160, -7936, -1616672, 22996480, -172976960, -22368256, 25518205568, -485458114560, 4964227109120, -209865342976, -1231298393825792, 29816107240652800, -379260096755225600 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..21.

MATHEMATICA

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

CROSSREFS

Cf. A012816.

Sequence in context: A299577 A259096 A317859 * A306105 A038103 A307254

Adjacent sequences:  A009339 A009340 A009341 * A009343 A009344 A009345

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 May 25 23:54 EDT 2019. Contains 323576 sequences. (Running on oeis4.)