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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 1 |
| 10 | 3628800 |
| 11 | 158815387962000 |
| 12 | 9254768770160124288000 |
| 13 | 769237071909157579108571190000 |
| 14 | 96986285294151066094112970262797953280 |
| 15 | 19092174983817380047229162651397270697765056000 |
[0,0,0,0,0,0,0,0,1,3628800,158815387962000, 9254768770160124288000, 769237071909157579108571190000, 96986285294151066094112970262797953280, 19092174983817380047229162651397270697765056000] |