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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 216 |
| 4 | 19584 |
| 5 | 4140000 |
| 6 | 1936704000 |
| 7 | 1610574336000 |
| 8 | 2195571603456000 |
[1,8,216,19584,4140000,1936704000,1610574336000, 2195571603456000] |