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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 5 |
| 3 | 33 |
| 4 | 1735 |
| 5 | 258210 |
| 6 | 143577818 |
| 7 | 241937973790 |
| 8 | 1250512009539459 |
[0,5,33,1735,258210,143577818,241937973790, 1250512009539459] |