$$U_{1128}(x, y) = \left(\frac{x \left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{2}}{4 y^{4}} + 1\right)^{3}$$

$$T_{1128}(n, m, k) = \frac{2 n {\binom{3 k}{n}} {\binom{2 m + 4 n}{m}}}{m + 2 n}$$