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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 9 |
| 4 | 37 |
| 5 | 45605 |
| 6 | 62102890005849 |
| 7 | 50579867441435760410772290593896794615932 |
[1,2,9,37,45605,62102890005849, 50579867441435760410772290593896794615932] |