$$U_{300}(x, y) = \frac{- x - \sqrt{x^{2} - 2 x - 4 y^{2} + 1} + 1}{2 y^{2}}$$

$$T_{300}(n, m, k) = \frac{k \left(\left(-1\right)^{m} + 1\right) {\binom{k + m}{\frac{m}{2}}} {\binom{k + m + n - 1}{n}}}{2 k + 2 m}$$