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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 236 |
| 5 | 363850 |
| 6 | 860077644 |
| 7 | 3040856393843 |
| 8 | 15614173687644042 |
[0,0,1,236,363850,860077644,3040856393843, 15614173687644042] |