$$U_{149}(x, y) = \frac{- 2 x y - \sqrt{- 4 x y^{2} - 4 x y + 1} + 1}{2 x y^{2}}$$

$$T_{149}(n, m, k) = \frac{k {\binom{2 n}{m}} {\binom{k + m}{n}}}{k + m}$$