OFFSET
0,3
FORMULA
a(n) ~ (n-1)! * (-1)^(n+1) / r^n, where r = 0.7426973079865501887067225087448265047287233394318... is the root of the equation exp(1/cos(r))*(r-1) = -1. - Vaclav Kotesovec, Jan 24 2015
MATHEMATICA
Log[ 1+Log[ 1+x ]*Cos[ x ] ]
CoefficientList[Series[Log[1 + Cos[x]*Log[1 + x]], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 24 2015 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved