$$U_{654}(x, y) = - \frac{2 \sqrt{3} \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{y}}{2} \right)}}{3} \right)}}{3 \sqrt{y} \left(\frac{4 x \sin^{2}{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{y}}{2} \right)}}{3} \right)}}{3 y} - 1\right)}$$

$$T_{654}(n, m, k) = \frac{k \left(k + 2 n\right) {\binom{k + n}{n}} {\binom{k + 3 m + 2 n - 1}{m}}}{\left(k + n\right) \left(k + 2 m + 2 n\right)}$$