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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 85 |
| 4 | 847 |
| 5 | 8989 |
| 6 | 93415 |
| 7 | 977509 |
| 8 | 10205503 |
| 9 | 106628845 |
| 10 | 1113800023 |
| 11 | 11635238581 |
| 12 | 121543470895 |
| 13 | 1269672885181 |
| 14 | 13263275148487 |
| 15 | 138551149905925 |
| 16 | 1447335954687007 |
| 17 | 15119193079422349 |
| 18 | 157938445924688695 |
[1,1,7,85,847,8989,93415,977509,10205503, 106628845,1113800023,11635238581,121543470895, 1269672885181,13263275148487,138551149905925, 1447335954687007,15119193079422349, 157938445924688695] |