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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 70 |
| 3 | 33607 |
| 4 | 56904056 |
| 5 | 249804639258 |
| 6 | 2365851085271034 |
| 7 | 42713565749790262494 |
[1,70,33607,56904056,249804639258, 2365851085271034,42713565749790262494] |