$$U_{1086}(x, y) = \frac{\left(1 - \sqrt{1 - 4 y}\right)^{3} \left(- 2 x - \sqrt{1 - 4 x} + 1\right)^{2}}{32 x^{4} y^{3}}$$

$$T_{1086}(n, m, k) = \frac{6 k^{2} {\binom{4 k + 2 n}{n}} {\binom{3 k + 2 m - 1}{m}}}{\left(2 k + n\right) \left(3 k + m\right)}$$