Generating function
$$U_{589}(x, y) = \frac{3 \sqrt{3} y^{\frac{3}{2}} \left(1 - \sqrt{- \frac{64 x \sin^{4}{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{y}}{2} \right)}}{3} \right)}}{9 y^{2}} + 1}\right)}{16 x \sin^{3}{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{y}}{2} \right)}}{3} \right)}}$$
Explicit formula
$$T_{589}(n, m, k) = \frac{k \left(k + 4 n\right) {\binom{k + 2 n - 1}{n}} {\binom{k + 3 m + 4 n - 1}{m}}}{\left(k + n\right) \left(k + 2 m + 4 n\right)}$$
1 | 1 | 3 | 12 | 55 | 273 | 1428 |
1 | 5 | 25 | 13 | 7 | 3876 | 21945 |
2 | 18 | 126 | 816 | 513 | 31878 | 19734 |
5 | 65 | 585 | 455 | 3289 | 22815 | 1543815 |
14 | 238 | 2618 | 238 | 194922 | 1497734 | 11037488 |
42 | 882 | 11466 | 119364 | 109368 | 9236304 | 73785474 |
132 | 33 | 495 | 5808 | 58905 | 5428566 | 4678674 |
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