计算$\left|\begin{array}{cccccc}
1 & 2 & 3 & \cdots & n-1 & n \\
-1 & 0 & 3 & \cdots & n-1 & n \\
-1 & -2 & 0 & \cdots & n-1 & n \\
\vdots & \vdots & \vdots & & \vdots & \vdots \\
-1 & -2 & -3 & \cdots & 0 & n \\
-1 & -2 & -3 & \cdots & -(n-1) & 0
\end{array}\right|$