$$U_{1354}(x, y) = \frac{1 - \sqrt{- \frac{4 x}{\left(1 - 4 y\right)^{\frac{3}{2}}} + 1}}{2 x}$$

$$T_{1354}(n, m, k) = \frac{4^{m} k {\binom{k + 2 n - 1}{n}} {\binom{\frac{3 k}{2} + m + \frac{3 n}{2} - 1}{m}}}{k + n}$$