$$U_{282}(x, y) = \frac{1 - \sqrt{y \left(- 4 x^{2} - 4\right) + 1}}{2 y}$$

$$T_{282}(n, m, k) = \frac{\left(\left(-1\right)^{n} + 1\right) {\binom{k}{m}} {\binom{k - m}{\frac{n}{2}}}}{2}$$