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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 27 |
| 3 | 270 |
| 4 | 2700 |
| 5 | 27000 |
| 6 | 270000 |
| 7 | 2700000 |
| 8 | 27000000 |
| 9 | 270000000 |
| 10 | 2700000000 |
| 11 | 27000000000 |
| 12 | 270000000000 |
| 13 | 2700000000000 |
| 14 | 27000000000000 |
| 15 | 270000000000000 |
| 16 | 2700000000000000 |
| 17 | 27000000000000000 |
| 18 | 270000000000000000 |
| 19 | 2700000000000000000 |
| 20 | 27000000000000000000 |
[0,27,270,2700,27000,270000,2700000,27000000, 270000000,2700000000,27000000000,270000000000, 2700000000000,27000000000000,270000000000000, 2700000000000000,27000000000000000, 270000000000000000,2700000000000000000, 27000000000000000000] |