\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Using the table below, find \(u_7\).
\(n\) 1 2 3 4 5 6 7 8
\(u_n\) 4 9 16 25 36 49 64 81
\(u_7=\)