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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5040 |
| 8 | 37248 |
| 9 | 319512 |
| 10 | 2918016 |
| 11 | 29152160 |
| 12 | 314633376 |
| 13 | 3963157656 |
| 14 | 50343312444 |
| 15 | 685581994146 |
| 16 | 10100992141840 |
[1,2,6,24,120,720,5040,37248,319512,2918016, 29152160,314633376,3963157656,50343312444, 685581994146,10100992141840] |