\[\boxed{\text{1201\ (1201).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[n(n - 1)(n + 1) + n =\]
\[= n\left( (n - 1)(n + 1) + 1 \right) =\]
\[= n\left( n^{2} - 1 + 1 \right) = n \cdot n^{2} = n^{3}\ \]