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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5040 |
| 8 | 40320 |
| 9 | 362880 |
| 10 | 3409920 |
| 11 | 34315200 |
| 12 | 368740224 |
| 13 | 4300411968 |
| 14 | 53509163328 |
| 15 | 712099875232 |
| 16 | 9936684346816 |
[1,2,6,24,120,720,5040,40320,362880,3409920, 34315200,368740224,4300411968,53509163328, 712099875232,9936684346816] |