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| n | a(n) |
|---|---|
| 9 | 40320 |
| 10 | 1632960 |
| 11 | 38102400 |
| 12 | 673596000 |
| 13 | 10035083520 |
| 14 | 133102569600 |
| 15 | 1623972430080 |
| 16 | 18615386790000 |
| 17 | 203401119841920 |
| 18 | 2140495978400640 |
| 19 | 21860934514473600 |
| 20 | 217932712305073920 |
| 21 | 2130148393318725120 |
| 22 | 20485620162998625600 |
| 23 | 194378546540211264000 |
| 24 | 1823813323809879402000 |
[40320,1632960,38102400,673596000,10035083520, 133102569600,1623972430080,18615386790000, 203401119841920,2140495978400640, 21860934514473600,217932712305073920, 2130148393318725120,20485620162998625600, 194378546540211264000,1823813323809879402000] |