\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
The first five terms of a geometric sequence are given in the table below.
\(n\) 0 1 2 3 4
\(u_n\) 1 -2 4 -8 16
Find the term \(u_5\) of this geometric sequence.
\(u_5=\)