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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 12 |
| 2 | 90 |
| 3 | 4320 |
| 4 | 418950 |
| 5 | 68045040 |
| 6 | 16408798560 |
| 7 | 5461729378560 |
| 8 | 2388307104414000 |
| 9 | 1323740028257460000 |
| 10 | 905000067758493495360 |
| 11 | 747005694270473162004480 |
| 12 | 731648558087385682524580800 |
[0,12,90,4320,418950,68045040,16408798560, 5461729378560,2388307104414000, 1323740028257460000,905000067758493495360, 747005694270473162004480, 731648558087385682524580800] |