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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 39 |
| 3 | 60879 |
| 4 | 225636660844959 |
| 5 | 11487591726386681145142587842614325062822719 |
[1,3,39,60879,225636660844959, 11487591726386681145142587842614325062822719] |