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| n | a(n) |
|---|---|
| 9 | 0 |
| 10 | 226800 |
| 11 | 7484400 |
| 12 | 157172400 |
| 13 | 2659456800 |
| 14 | 43740496800 |
| 15 | 662918256000 |
| 16 | 9500819328000 |
[0,226800,7484400,157172400,2659456800, 43740496800,662918256000,9500819328000] |