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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 16 |
| 3 | 648 |
| 4 | 55296 |
| 5 | 207360000 |
| 6 | 10749542400 |
| 7 | 23044331520000 |
| 8 | 220242357780480000 |
| 9 | 5780040437590917120000 |
| 10 | 3538800267912806400000000 |
| 11 | 115398507336502660300800000000 |
| 12 | 5264387585885382160794255360000000 |
| 13 | 1835850718442886445597615718400000000 |
[1,16,648,55296,207360000,10749542400, 23044331520000,220242357780480000, 5780040437590917120000,3538800267912806400000000, 115398507336502660300800000000, 5264387585885382160794255360000000, 1835850718442886445597615718400000000] |