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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 9 |
| 3 | 1472 |
| 4 | 2572816 |
| 5 | 48909857500 |
| 6 | 10211121295308649 |
| 7 | 23397344246732649325860 |
[0,9,1472,2572816,48909857500,10211121295308649, 23397344246732649325860] |