$$U_{140}(x, y) = \frac{- y + \sqrt{4 x + y^{2} + y \left(4 x + 2\right) + 1} - 1}{2 x y + 2 x}$$

$$T_{140}(n, m, k) = \frac{\left(-1\right)^{m + n} k {\binom{k + 2 n - 1}{n}} {\binom{k + m + n - 1}{m}}}{k + n}$$