| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 120 |
| 2 | 29392 |
| 3 | 7453320 |
| 4 | 1897242448 |
| 5 | 482913033152 |
| 6 | 122911984813568 |
| 7 | 31283451053916800 |
| 8 | 7962224756951452544 |
| 9 | 2026535155335964884480 |
| 10 | 515791104488454210243072 |
| 11 | 131278484324109833244067840 |
| 12 | 33412829924638979294019463168 |
| 13 | 8504190228674549912505288509440 |
[1,120,29392,7453320,1897242448,482913033152, 122911984813568,31283451053916800, 7962224756951452544,2026535155335964884480, 515791104488454210243072, 131278484324109833244067840, 33412829924638979294019463168, 8504190228674549912505288509440] |