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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 1503 |
| 3 | 61750 |
| 4 | 5913287 |
| 5 | 1152135751 |
| 6 | 522548961680 |
| 7 | 503953627472071 |
| 8 | 1150154956960934843 |
[81,1503,61750,5913287,1152135751,522548961680, 503953627472071,1150154956960934843] |