$$U_{1104}(x, y) = \frac{x \left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{2}}{4 y^{4}} + 1$$

$$T_{1104}(n, m, k) = \begin{cases}1&\text{if n=0,m=0} ,\ \\\frac{2 n {\binom{k}{n}} {\binom{2 m + 4 n}{m}}}{m + 2 n} \end{cases} $$