OFFSET
0,4
MATHEMATICA
Log[ 1+Tanh[ Tan[ x ] ] ]
CoefficientList[Series[Log[1 + Tanh[Tan[x]]], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved