$$U_{442}(x, y) = \frac{x^{2} - 2 x - 2 y + \left(x - 1\right) \sqrt{x^{2} - 2 x - 4 y + 1} + 1}{2 y^{2}}$$

$$T_{442}(n, m, k) = \frac{k {\binom{2 k + 2 m}{m}} {\binom{2 k + 2 m + n - 1}{n}}}{k + m}$$