$$U_{181}(x, y) = \frac{x^{2} + 2 x - \sqrt{\left(x + 1\right) \left(x^{3} + 3 x^{2} + 3 x + 4 y + 1\right)} + 1}{y \left(2 x + 2\right)}$$

$$T_{181}(n, m, k) = \frac{\left(-1\right)^{- k - m + n} k {\binom{k + 2 m - 1}{m}} {\binom{2 k + 3 m + n - 1}{n}}}{k + m}$$