$$U_{1357}(x, y) = \frac{2 \sqrt{3} \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{x} \left(1 - \sqrt{1 - 4 y}\right)}{4 y} \right)}}{3} \right)}}{3 \sqrt{x}}$$

$$T_{1357}(n, m, k) = \frac{k {\binom{k + 3 n - 1}{n}} {\binom{k + 2 m + 2 n - 1}{m}}}{k + m + 2 n}$$