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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 8 |
| 3 | 432 |
| 4 | 131072 |
| 5 | 204800000 |
| 6 | 1565515579392 |
| 7 | 56593444029595648 |
| 8 | 9444732965739290427392 |
| 9 | 7146646609494406531041460224 |
| 10 | 24178516392292583494123520000000000 |
[0,1,8,432,131072,204800000,1565515579392, 56593444029595648,9444732965739290427392, 7146646609494406531041460224, 24178516392292583494123520000000000] |