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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 27 |
| 4 | 189 |
| 5 | 729 |
| 6 | 24057 |
| 7 | 104247 |
| 8 | 938223 |
| 9 | 4349943 |
| 10 | 82648917 |
| 11 | 400529367 |
| 12 | 3948075189 |
| 13 | 19740375945 |
| 14 | 1598970451545 |
| 15 | 8182966428495 |
| 16 | 84557319761115 |
[1,1,9,27,189,729,24057,104247,938223,4349943, 82648917,400529367,3948075189,19740375945, 1598970451545,8182966428495,84557319761115] |