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| n | a(n) |
|---|---|
| 1 | 187 |
| 2 | 69988 |
| 3 | 1901508 |
| 4 | 103672036 |
| 5 | 8045978096 |
| 6 | 647640659639 |
| 7 | 52428246114853 |
[187,69988,1901508,103672036,8045978096, 647640659639,52428246114853] |