$$U_{948}(x, y) = \frac{- y \left(2 x^{2} + 2 x\right) - \sqrt{y \left(- 4 x^{2} - 4 x\right) + 1} + 1}{y^{2} \left(2 x + 2\right)}$$

$$T_{948}(n, m, k) = \frac{k {\binom{k + m}{- 2 k - m + n}} {\binom{2 k + 2 m}{m}}}{k + m}$$