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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 19 |
| 4 | 193 |
| 5 | 1801 |
| 6 | 56240459218944001 |
| 7 | 112873711099106889552388221969528619131820978659655680000000000001 |
[2,5,19,193,1801,56240459218944001, 11287371109910688955238822196952861913182097865965\ 5680000000000001] |