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| n | a(n) |
|---|---|
| 7 | 720 |
| 8 | 40320 |
| 9 | 1632960 |
| 10 | 60480000 |
| 11 | 2213719200 |
| 12 | 82771476480 |
| 13 | 3211179491520 |
| 14 | 130241382036480 |
| 15 | 5541589755702000 |
| 16 | 247667354552217600 |
| 17 | 11627089698327143040 |
| 18 | 573008938660751523840 |
| 19 | 29613698207957813302080 |
| 20 | 1602975684200327700480000 |
| 21 | 90757379602253683020931200 |
[720,40320,1632960,60480000,2213719200, 82771476480,3211179491520,130241382036480, 5541589755702000,247667354552217600, 11627089698327143040,573008938660751523840, 29613698207957813302080,1602975684200327700480000, 90757379602253683020931200] |