Generating function
$$U_{1179}(x, y) = \frac{64 y^{18} \left(1 - \sqrt{- \frac{x \left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{3}}{2 y^{6}} + 1}\right)^{3}}{x^{3} \left(- 2 y - \sqrt{1 - 4 y} + 1\right)^{9}}$$
Explicit formula
$$T_{1179}(n, m, k) = \frac{9 k n {\binom{2 m + 6 n}{m}} {\binom{3 k + 2 n - 1}{n}}}{\left(3 k + n\right) \left(m + 3 n\right)}$$
Data table
nan 0 0 0 0 0 0
3 18 81 33 1287 4914 18564
9 108 81 4896 26163 129276 605682
28 504 5292 42504 2898 176904 997542
9 216 2916 29232 24273 1767744 11686752
297 891 147015 176715 17307675 146571282 111285603
1001 36036 702702 984984 111180069 1073836764 9212837634
Related
Export
expand_less