\[\begin{array}{l} {\text{Вычислите:}} \hfill \\ \frac{{{{2020}^2}}}{{1 + \frac{{{{2019}^2}}}{{1 + \frac{{{{2018}^2}}}{{1 + ... + \frac{{{4^2}}}{{1 + \frac{{{3^2}}}{{1 + \frac{{{2^2}}}{{1 + 1}}}}}}}}}}}}. \hfill \\ \end{array}\]