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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 24 |
| 7 | 378 |
| 8 | 4960 |
| 9 | 58905 |
| 10 | 658008 |
| 11 | 7059052 |
| 12 | 73629072 |
| 13 | 752538150 |
| 14 | 7575968400 |
| 15 | 75394027566 |
| 16 | 743595781824 |
| 17 | 7282025622664 |
| 18 | 70907466006720 |
| 19 | 687259244541600 |
| 20 | 6635869816740560 |
| 21 | 63871405575418665 |
| 22 | 613156553427009240 |
[1,24,378,4960,58905,658008,7059052,73629072, 752538150,7575968400,75394027566,743595781824, 7282025622664,70907466006720,687259244541600, 6635869816740560,63871405575418665, 613156553427009240] |