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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 120 |
| 3 | 5376 |
| 4 | 415104 |
| 5 | 48143744 |
| 6 | 7784817664 |
| 7 | 1673986906112 |
| 8 | 462531126525952 |
| 9 | 159859054841331712 |
| 10 | 67616604530628853760 |
| 11 | 34373912421215807799296 |
| 12 | 20685291456673100857344000 |
[1,6,120,5376,415104,48143744,7784817664, 1673986906112,462531126525952,159859054841331712, 67616604530628853760,34373912421215807799296, 20685291456673100857344000] |