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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 160 |
| 3 | 40320 |
| 4 | 71680 |
| 5 | 1277337600 |
| 6 | 79705866240 |
| 7 | 167382319104000 |
| 8 | 91055981592576000 |
| 9 | 62282291409321984000 |
| 10 | 4024394214140805120000 |
| 11 | 5882770031248492462080000 |
| 12 | 9076273762497674084352000000 |
[1,12,160,40320,71680,1277337600,79705866240, 167382319104000,91055981592576000, 62282291409321984000,4024394214140805120000, 5882770031248492462080000, 9076273762497674084352000000] |