A009335 - OEIS

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A009335

Expansion of log(1+sin(x))/cos(x).

0, 1, -1, 4, -8, 40, -121, 768, -3128, 24320, -124921, 1152512, -7158128, 76477440, -557749921, 6773211136, -56767019408, 772218880000, -7316056402321, 110191426928640, -1164842760597368, 19241219430809600

(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 ] ]/Cos[ x ]

CoefficientList[Series[Log[1 + Sin[x]]*Sec[x], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)

CROSSREFS

Sequence in context: A062898 A343810 A165458 * A303566 A165622 A162076

Adjacent sequences: A009332 A009333 A009334 * A009336 A009337 A009338

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved