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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 300 |
| 3 | 141120 |
| 4 | 182952000 |
| 5 | 505008504000 |
| 6 | 2547446533632000 |
| 7 | 21222189199411200000 |
| 8 | 271682221693022300160000 |
| 9 | 5064076705822143609600000000 |
| 10 | 131801391770668241689267200000000 |
| 11 | 4632178742550388306775251353600000000 |
[1,3,300,141120,182952000,505008504000, 2547446533632000,21222189199411200000, 271682221693022300160000, 5064076705822143609600000000, 131801391770668241689267200000000, 4632178742550388306775251353600000000] |