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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 79 |
| 3 | 681 |
| 4 | 5987 |
| 5 | 52649 |
| 6 | 463087 |
| 7 | 4073225 |
| 8 | 35827395 |
| 9 | 315131721 |
| 10 | 2771845519 |
| 11 | 24380686185 |
| 12 | 214448408099 |
| 13 | 1886252068073 |
| 14 | 16591155401263 |
| 15 | 145933007686601 |
| 16 | 1283602149301635 |
| 17 | 11290348248219273 |
| 18 | 99308001030865615 |
[1,9,79,681,5987,52649,463087,4073225,35827395, 315131721,2771845519,24380686185,214448408099, 1886252068073,16591155401263,145933007686601, 1283602149301635,11290348248219273, 99308001030865615] |