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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 11 |
| 3 | 89 |
| 4 | 959 |
| 5 | 12917 |
| 6 | 208781 |
| 7 | 3937019 |
| 8 | 84846899 |
| 9 | 2057107337 |
| 10 | 55416031601 |
| 11 | 1642126375199 |
| 12 | 53084324076839 |
| 13 | 1859037341680157 |
| 14 | 70112365228588421 |
| 15 | 2833115932639555379 |
| 16 | 122113252334984094779 |
| 17 | 5592296493425013663377 |
| 18 | 271169701559687033317241 |
[1,2,11,89,959,12917,208781,3937019,84846899, 2057107337,55416031601,1642126375199, 53084324076839,1859037341680157,70112365228588421, 2833115932639555379,122113252334984094779, 5592296493425013663377,271169701559687033317241] |