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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 96 |
| 6 | 72 |
| 7 | 14400 |
| 8 | 16 |
| 9 | 38400 |
| 10 | 3456000 |
| 11 | 1 |
| 12 | 27000 |
| 13 | 22104000 |
| 14 | 1270080000 |
| 15 | 7200 |
| 16 | 34905600 |
| 17 | 16111872000 |
| 18 | 682795008000 |
| 19 | 856 |
| 20 | 21154176 |
| 21 | 48248363520 |
| 22 | 15279164006400 |
| 23 | 516193026048000 |
| 24 | 48 |
| 25 | 6064128 |
| 26 | 54644474880 |
| 27 | 78083415244800 |
[1,96,72,14400,16,38400,3456000,1,27000,22104000, 1270080000,7200,34905600,16111872000,682795008000, 856,21154176,48248363520,15279164006400, 516193026048000,48,6064128,54644474880, 78083415244800] |