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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 8 |
| 3 | 1716 |
| 4 | 129874 |
| 5 | 10308020 |
| 6 | 918775180 |
| 7 | 84808478358 |
| 8 | 7687975511996 |
[0,8,1716,129874,10308020,918775180,84808478358, 7687975511996] |