$$U_{210}(x, y) = \frac{1 - \sqrt{y \left(- 4 x^{3} - 12 x^{2} - 12 x - 4\right) + 1}}{y \left(2 x + 2\right)}$$

$$T_{210}(n, m, k) = \frac{k {\binom{2 k + 3 m}{n}} {\binom{k + 2 m - 1}{m}}}{k + m}$$