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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 1960 |
| 3 | 2240000 |
| 4 | 7037430400 |
| 5 | 47023181004800 |
| 6 | 573855569801113600 |
| 7 | 11561744236447268864000 |
| 8 | 357878145625000000000000000 |
| 9 | 16126894605060719806880153600000 |
| 10 | 1014615361149039162308699493990400000 |
| 11 | 86191463407361600308443922239271731200000 |
[1,8,1960,2240000,7037430400,47023181004800, 573855569801113600,11561744236447268864000, 357878145625000000000000000, 16126894605060719806880153600000, 1014615361149039162308699493990400000, 86191463407361600308443922239271731200000] |