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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 7 |
| 3 | 121 |
| 4 | 5461 |
| 5 | 12207031 |
| 6 | 2612138803 |
| 7 | 38771752331201 |
| 8 | 20587884010836553 |
| 9 | 1107867264956562636991 |
| 10 | 11111111111111111111111111111 |
| 11 | 19194342495775048050414684129181 |
| 12 | 773238409074645649506921062192257266781 |
| 13 | 391287702091575733090747617444785169589677401 |
[2,7,121,5461,12207031,2612138803,38771752331201, 20587884010836553,1107867264956562636991, 11111111111111111111111111111, 19194342495775048050414684129181, 773238409074645649506921062192257266781, 391287702091575733090747617444785169589677401] |