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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 31 |
| 4 | 271 |
| 5 | 4591 |
| 6 | 151471 |
| 7 | 9845551 |
| 8 | 326409519151 |
| 9 | 16455349947998422816223361143099916435126171767057238357700938736968751 |
[3,7,31,271,4591,151471,9845551,326409519151, 16455349947998422816223361143099916435126171767057\ 238357700938736968751] |