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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 139 |
| 3 | 13927 |
| 4 | 1392781 |
| 5 | 1392781243 |
| 6 | 1392781243729 |
| 7 | 13927812437292187 |
| 8 | 139278124372921876561 |
| 9 | 13927812437292187656119683 |
| 10 | 1392781243729218765611968359049 |
| 11 | 1392781243729218765611968359049177147 |
| 12 | 1392781243729218765611968359049177147531441 |
[1,13,139,13927,1392781,1392781243,1392781243729, 13927812437292187,139278124372921876561, 13927812437292187656119683, 1392781243729218765611968359049, 1392781243729218765611968359049177147, 1392781243729218765611968359049177147531441] |