$$U_{608}(x, y) = - \frac{1}{\left(1 - 4 y\right)^{\frac{3}{2}} \left(x - \frac{1}{1 - 4 y}\right)}$$

$$T_{608}(n, m, k) = 4^{m} {\binom{k + n - 1}{n}} {\binom{\frac{k}{2} + m - n - 1}{m}}$$