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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 37 |
| 3 | 3159 |
| 4 | 756105 |
| 5 | 611600765 |
| 6 | 1801639049917 |
| 7 | 20003526775817379 |
[1,37,3159,756105,611600765,1801639049917, 20003526775817379] |