A009342 Expansion of log(1+sin(x)/cosh(x)).

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

Links

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

Mathematica

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

Crossrefs

Cf. A012816.

Sequence in context: A342539 A346810 A347024 * A357486 A350508 A306105

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