$$U_{607}(x, y) = \frac{- \sqrt{- \frac{4 x}{\left(1 - 4 y\right)^{\frac{3}{2}}} + \frac{1}{\left(1 - 4 y\right)^{2}}} + \frac{1}{1 - 4 y}}{2 x}$$

$$T_{607}(n, m, k) = \frac{4^{m} k {\binom{k + 2 n - 1}{n}} {\binom{\frac{k}{2} + m - \frac{n}{2} - 1}{m}}}{k + n}$$