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| n | a(n) |
|---|---|
| 1 | 191 |
| 2 | 536871173 |
| 3 | 2199023255921 |
| 4 | 10384593717069655257060992658441209 |
[191,536871173,2199023255921, 10384593717069655257060992658441209] |