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A009420
Expansion of log(1+x)*exp(tanh(x)).
9
0, 1, 1, 2, -8, -11, -19, 846, -1896, -111, -228159, 2453010, -11353440, 173733429, -3565851587, 41759789358, -501111404080, 9579604130881, -176443305192159, 2870638703204994, -53275482352387864, 1134671091039714069
OFFSET
0,4
FORMULA
a(n) ~ (n-1)! * (-1)^(n+1) * exp(-tanh(1)). - Vaclav Kotesovec, Jan 23 2015
MATHEMATICA
Log[ 1+x ]*Exp[ Tanh[ x ] ]
CoefficientList[Series[E^Tanh[x]*Log[1 + x], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)
CROSSREFS
Sequence in context: A056550 A074263 A295070 * A189328 A090746 A362869
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved