$$U_{496}(x, y) = - \frac{1}{\left(1 - y\right) \left(\frac{x}{\left(1 - y\right)^{2}} - 1\right)}$$

$$T_{496}(n, m, k) = \frac{k {\binom{k + n}{n}} {\binom{k + m + 2 n - 1}{m}}}{k + n}$$