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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 2 |
| 3 | 3 |
| 4 | 13 |
| 5 | 125411328001 |
| 6 | 69113789582492712943486800506462734562847413501952000000000000001 |
[2,2,3,13,125411328001, 69113789582492712943486800506462734562847413501952\ 000000000000001] |