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| n | a(n) |
|---|---|
| 8 | 720 |
| 9 | 35280 |
| 10 | 915984 |
| 11 | 16939800 |
| 12 | 251869440 |
| 13 | 3213860944 |
| 14 | 36634201456 |
| 15 | 383130347344 |
| 16 | 3745749248752 |
| 17 | 34704916926064 |
| 18 | 307859356272208 |
| 19 | 2635356154189416 |
| 20 | 21904079389753056 |
| 21 | 177636951598742640 |
[720,35280,915984,16939800,251869440,3213860944, 36634201456,383130347344,3745749248752, 34704916926064,307859356272208,2635356154189416, 21904079389753056,177636951598742640] |