$$U_{1101}(x, y) = \frac{\left(- 2 x - \sqrt{1 - 4 x} + 1\right)^{3} \left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{3}}{64 x^{6} y^{6}}$$

$$T_{1101}(n, m, k) = \frac{9 k^{2} {\binom{6 k + 2 m}{m}} {\binom{6 k + 2 n}{n}}}{\left(3 k + m\right) \left(3 k + n\right)}$$