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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 435 |
| 3 | 227920 |
| 4 | 1278098745 |
| 5 | 82575323184816 |
| 6 | 65027115220581214701 |
| 7 | 650673256738362079479972000 |
| 8 | 85317908524399246240116500743559745 |
| 9 | 150076667939221169116862871933576383129271760 |
[1,8,435,227920,1278098745,82575323184816, 65027115220581214701,650673256738362079479972000, 85317908524399246240116500743559745, 150076667939221169116862871933576383129271760] |