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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 288 |
| 4 | 33280 |
| 5 | 16793600 |
| 6 | 34360786944 |
| 7 | 281475110928384 |
| 8 | 9223372071214514176 |
| 9 | 1208925819632221360750592 |
| 10 | 633825300114132715146861084672 |
| 11 | 1329227995784915909797295207699447808 |
| 12 | 11150372599265311570918974863776009399828480 |
[1,2,12,288,33280,16793600,34360786944, 281475110928384,9223372071214514176, 1208925819632221360750592, 633825300114132715146861084672, 1329227995784915909797295207699447808, 11150372599265311570918974863776009399828480] |