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A024331 Expansion of log(1+x)*log(1+tanh(x))/2. 1
0, 0, 1, -3, 7, -20, 102, -658, 4364, -32736, 293760, -2954512, 31998048, -377807040, 4885788992, -68173993856, 1016048413440, -16157627437056, 273596846948352, -4908327247431680, 92923391633776640, -1852316352709746688 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

MATHEMATICA

With[{nn=30}, CoefficientList[Series[Log[1+x]*Log[1+Tanh[x]]/2, {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Nov 30 2013 *)

CROSSREFS

Cf. A009423.

Sequence in context: A232687 A211602 A110149 * A007174 A091184 A174348

Adjacent sequences:  A024328 A024329 A024330 * A024332 A024333 A024334

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs, Mar 1997

Prior Mathematica program replaced by Harvey P. Dale, Nov 30 2013

STATUS

approved

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Last modified July 29 06:36 EDT 2021. Contains 346340 sequences. (Running on oeis4.)