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| n | a(n) |
|---|---|
| 6 | 120 |
| 7 | 1050 |
| 8 | 12712 |
| 9 | 141876 |
| 10 | 1418400 |
| 11 | 17061660 |
| 12 | 212254548 |
| 13 | 2735287698 |
| 14 | 37354035628 |
| 15 | 581350330470 |
| 16 | 8895742806480 |
| 17 | 151305163230480 |
| 18 | 2659183039338192 |
| 19 | 50112909523522476 |
| 20 | 976443721325014300 |
| 21 | 20413628375979803370 |
| 22 | 434137453618439716068 |
[120,1050,12712,141876,1418400,17061660,212254548, 2735287698,37354035628,581350330470,8895742806480, 151305163230480,2659183039338192, 50112909523522476,976443721325014300, 20413628375979803370,434137453618439716068] |