$$U_{192}(x, y) = \frac{2 x y - \sqrt{1 - 4 y} + 1}{2 y}$$

$$T_{192}(n, m, k) = \begin{cases}{\binom{k}{n}}&\text{if m=0} ,\ \\\frac{\left(-1\right)^{m - 1} k {\binom{k - 1}{n}} {\binom{- k - m + n - 1}{m - 1}}}{m} \end{cases} $$