$$U_{395}(x, y) = \frac{\sqrt{1 - 4 y} - \sqrt{- 4 x - 4 y + 1}}{2 x}$$

$$T_{395}(n, m, k) = \frac{4^{m} k {\binom{k + 2 n - 1}{n}} {\binom{\frac{k}{2} + m + n - 1}{m}}}{k + n}$$