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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5040 |
| 8 | 36096 |
| 9 | 285000 |
| 10 | 2423808 |
| 11 | 22775088 |
| 12 | 226542688 |
| 13 | 2534993112 |
| 14 | 29951845088 |
| 15 | 382504742828 |
| 16 | 5166221435088 |
[1,2,6,24,120,720,5040,36096,285000,2423808, 22775088,226542688,2534993112,29951845088, 382504742828,5166221435088] |