$$U_{94}(x, y) = \frac{x + y}{\sqrt{- 4 x - 4 y + 1}}$$

$$T_{94}(n, m, k) = 4^{- k + m + n} {\binom{m + n}{m}} {\binom{- \frac{k}{2} + m + n - 1}{- k + m + n}}$$