$$U_{105}(x, y) = \frac{x^{2} - 2 x + y^{2} - 2 y + \left(x + y - 1\right) \sqrt{x^{2} - 2 x + y^{2} + y \left(- 2 x - 2\right) + 1} + 1}{2 x^{2} y^{2}}$$

$$T_{105}(n, m, k) = \frac{2 k {\binom{2 k + m + n}{m}} {\binom{2 k + m + n}{2 k + m}}}{2 k + m + n}$$