\[\boxed{\mathbf{707\ (707).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 2,\ 9,\ 28,\ 65,\ 126,\ \ldots,\ a_{n} =\]
\[= n^{3} + 1;\]
\[2)\ \frac{1}{2},\frac{1}{6},\frac{1}{12},\frac{1}{20},\frac{1}{30},\ldots,\ a_{n} =\]
\[= \frac{1}{n^{2} + n}.\]