$$U_{301}(x, y) = \frac{2 \sin{\left(\frac{\arcsin{\left(\sqrt{\frac{27 x}{4} + \frac{27 y}{4}} \right)}}{3} \right)}}{\sqrt{3 x + 3 y}}$$

$$T_{301}(n, m, k) = \frac{k {\binom{m + n}{m}} {\binom{k + 3 m + 3 n - 1}{m + n}}}{k + 2 m + 2 n}$$