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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 16 |
| 4 | 120 |
| 5 | 648 |
| 6 | 5040 |
| 7 | 38592 |
| 8 | 362880 |
| 9 | 3600000 |
| 10 | 39916800 |
| 11 | 476928000 |
| 12 | 6227020800 |
| 13 | 87127488000 |
| 14 | 1307674368000 |
[1,6,16,120,648,5040,38592,362880,3600000, 39916800,476928000,6227020800,87127488000, 1307674368000] |