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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 18 |
| 4 | 32400 |
| 5 | 17146080000 |
| 6 | 5838929512416000000 |
| 7 | 2371384771694500507545600000000 |
| 8 | 1912347371757319698802901729638809600000000000 |
| 9 | 4729554291048229774403876712233157022270603395072000000000000000 |
| 10 | 52408889027141714669562863434538278134100104813558451332105036103680000000000000000000 |
[1,1,1,18,32400,17146080000,5838929512416000000, 2371384771694500507545600000000, 1912347371757319698802901729638809600000000000, 47295542910482297744038767122331570222706033950720\ 00000000000000, 52408889027141714669562863434538278134100104813558\ 451332105036103680000000000000000000] |