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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
OFFSET
0,4
MATHEMATICA
Log[ 1+Sin[ x ]/Cosh[ x ] ]
CROSSREFS
Cf. A012816.
Sequence in context: A342539 A346810 A347024 * A357486 A350508 A306105
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved