Generating function
$$U_{585}(x, y) = \frac{\sqrt{3} \left(2 - \frac{8 \sin^{2}{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{- x}}{2} \right)}}{3} \right)}}{3}\right) \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{y}}{2} \right)}}{3} \right)}}{3 \sqrt{y}}$$
Explicit formula
$$T_{585}(n, m, k) = \begin{cases}\frac{k {\binom{k + 3 m - 1}{m}}}{k + 2 m}&\text{if n==0} ,\ \\\frac{\left(-1\right)^{n - 1} k^{2} {\binom{- k + 3 n - 1}{n - 1}} {\binom{k + 3 m - 1}{m}}}{n \left(k + 2 m\right)}&\text{if n>0} \end{cases} $$
1 | 1 | 3 | 12 | 55 | 273 | 1428 |
1 | 1 | 3 | 12 | 55 | 273 | 1428 |
-2 | -2 | -6 | -24 | -11 | -546 | -2856 |
7 | 7 | 21 | 84 | 385 | 1911 | 9996 |
-3 | -3 | -9 | -36 | -165 | -819 | -4284 |
143 | 143 | 429 | 1716 | 7865 | 39039 | 204204 |
-728 | -728 | -2184 | -8736 | -4004 | -198744 | -1039584 |
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