OFFSET
0,4
FORMULA
a(n) ~ (n-1)! * (-1)^(n+1) * 2^(2*n+1) * cos(n*arctan(2*log(2+sqrt(3))/Pi)) / (Pi^2 + 4*log(2+sqrt(3))^2)^(n/2). - Vaclav Kotesovec, Jan 23 2015
MATHEMATICA
Log[ 1+Sin[ x ]*Cos[ x ] ]
CoefficientList[Series[Log[1 + Cos[x]*Sin[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