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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 105 |
| 4 | 5760 |
| 5 | 328185 |
| 6 | 42577920 |
| 7 | 5568833025 |
| 8 | 1300252262400 |
| 9 | 304513870485825 |
| 10 | 111644006842368000 |
| 11 | 40992233865440682825 |
| 12 | 21695920874860629196800 |
| 13 | 11492457771692770753505625 |
| 14 | 8291067715225260172247040000 |
[1,8,105,5760,328185,42577920,5568833025, 1300252262400,304513870485825,111644006842368000, 40992233865440682825,21695920874860629196800, 11492457771692770753505625, 8291067715225260172247040000] |