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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 13 |
| 3 | 115 |
| 4 | 1243 |
| 5 | 11598 |
| 6 | 110995 |
| 7 | 1053489 |
| 8 | 9540747 |
| 9 | 85820627 |
| 10 | 770618921 |
| 11 | 6892469296 |
| 12 | 61437526441 |
| 13 | 548885702669 |
| 14 | 4911226981619 |
| 15 | 43974803859339 |
| 16 | 394217661482450 |
| 17 | 3536470866223484 |
| 18 | 31727866780706631 |
| 19 | 284622463808862333 |
[2,13,115,1243,11598,110995,1053489,9540747, 85820627,770618921,6892469296,61437526441, 548885702669,4911226981619,43974803859339, 394217661482450,3536470866223484, 31727866780706631,284622463808862333] |