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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 11 |
| 3 | 91 |
| 4 | 1105 |
| 5 | 13841 |
| 6 | 230731 |
| 7 | 3955771 |
| 8 | 80483201 |
| 9 | 1738065025 |
| 10 | 41800101931 |
| 11 | 1070731623611 |
| 12 | 29804263624081 |
| 13 | 878224530964561 |
| 14 | 27672361220570795 |
| 15 | 919409968480087771 |
| 16 | 32304618825218432641 |
| 17 | 1191168445737728717441 |
| 18 | 46119903359374012564171 |
[1,1,11,91,1105,13841,230731,3955771,80483201, 1738065025,41800101931,1070731623611, 29804263624081,878224530964561,27672361220570795, 919409968480087771,32304618825218432641, 1191168445737728717441,46119903359374012564171] |