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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 324 |
| 2 | 421200 |
| 3 | 546717924 |
| 4 | 709639444800 |
| 5 | 921111452633124 |
| 6 | 1195601955878350800 |
| 7 | 1551890417618646705924 |
| 8 | 2014352566467047545939200 |
| 9 | 2614628079383810095982376324 |
| 10 | 3393785232687619037537578530000 |
[0,324,421200,546717924,709639444800, 921111452633124,1195601955878350800, 1551890417618646705924,2014352566467047545939200, 2614628079383810095982376324, 3393785232687619037537578530000] |