$$U_{104}(x, y) = \frac{2 x + \sqrt{4 x^{2} + y^{2} - 2 y + 1}}{y^{2} - 2 y + 1}$$

$$T_{104}(n, m, k) = \frac{4^{n} k {\binom{\frac{k}{2} + \frac{n}{2}}{\frac{k}{2} - \frac{n}{2}}} {\binom{k + m + n - 1}{m}}}{k + n}$$