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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 | 3421440 |
| 11 | 35166240 |
| 12 | 389352960 |
| 13 | 4694073888 |
| 14 | 60648751360 |
| 15 | 846964682016 |
| 16 | 12402576279936 |
[1,2,6,24,120,720,5040,40320,362880,3421440, 35166240,389352960,4694073888,60648751360, 846964682016,12402576279936] |