$$U_{103}(x, y) = \frac{2 y + \sqrt{x^{2} - 2 x + 4 y^{2} + 1}}{x^{2} - 2 x + 1}$$

$$T_{103}(n, m, k) = \frac{4^{m} k {\binom{\frac{k}{2} + \frac{m}{2}}{\frac{k}{2} - \frac{m}{2}}} {\binom{k + m + n - 1}{n}}}{k + m}$$