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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 606 |
| 4 | 3416992 |
| 5 | 125879845460 |
| 6 | 23548106318659596 |
| 7 | 18419713779316213098798 |
| 8 | 51819721687533499412779736320 |
| 9 | 464092875294121232699449367220361200 |
| 10 | 11955340654858543651865928739816679891692800 |
[0,2,606,3416992,125879845460,23548106318659596, 18419713779316213098798, 51819721687533499412779736320, 464092875294121232699449367220361200, 11955340654858543651865928739816679891692800] |