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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 60 |
| 4 | 5040 |
| 5 | 604800 |
| 6 | 99792000 |
| 7 | 21794572800 |
| 8 | 6102480384000 |
| 9 | 2134124568576000 |
| 10 | 912338253066240000 |
| 11 | 468333636574003200000 |
| 12 | 284372184127734743040000 |
| 13 | 201645730563302817792000000 |
| 14 | 165147853331345007771648000000 |
[1,60,5040,604800,99792000,21794572800, 6102480384000,2134124568576000,912338253066240000, 468333636574003200000,284372184127734743040000, 201645730563302817792000000, 165147853331345007771648000000] |