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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 1440 |
| 3 | 604800 |
| 4 | 609638400 |
| 5 | 1207084032000 |
| 6 | 4142712397824000 |
| 7 | 22619209692119040000 |
| 8 | 184572751087691366400000 |
| 9 | 2146211949647675208499200000 |
| 10 | 34253542716376896327647232000000 |
| 11 | 727956289808441800755158974464000000 |
| 12 | 20091593598712993700842387695206400000000 |
[1,12,1440,604800,609638400,1207084032000, 4142712397824000,22619209692119040000, 184572751087691366400000, 2146211949647675208499200000, 34253542716376896327647232000000, 727956289808441800755158974464000000, 20091593598712993700842387695206400000000] |