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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 21 |
| 3 | 2708 |
| 4 | 2702336 |
| 5 | 24410499168 |
| 6 | 2104896553943040 |
| 7 | 1778444003240055248640 |
| 8 | 14939769469723143490555084800 |
| 9 | 1259088365662049769772300690661574656 |
| 10 | 1070947202979258392244674442279023145910272000 |
| 11 | 9231770604513665531846104652770226955879223011179905024 |
[1,21,2708,2702336,24410499168,2104896553943040, 1778444003240055248640, 14939769469723143490555084800, 1259088365662049769772300690661574656, 1070947202979258392244674442279023145910272000, 92317706045136655318461046527702269558792230111799\ 05024] |