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| n | a(n) |
|---|---|
| 1 | -1 |
| 2 | 0 |
| 3 | 6 |
| 4 | 384 |
| 5 | 29160 |
| 6 | 2949120 |
| 7 | 393750000 |
| 8 | 67722117120 |
| 9 | 14643516908160 |
| 10 | 3896394330931200 |
| 11 | 1252631480200531200 |
| 12 | 479001600000000000000 |
| 13 | 214973646592670930764800 |
| 14 | 111929817779497742421196800 |
[-1,0,6,384,29160,2949120,393750000,67722117120, 14643516908160,3896394330931200, 1252631480200531200,479001600000000000000, 214973646592670930764800, 111929817779497742421196800] |