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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 22 |
| 5 | 122 |
| 6 | 222 |
| 7 | 1222 |
| 8 | 2222 |
| 9 | 12222 |
| 10 | 22222 |
| 11 | 122222 |
| 12 | 222222 |
| 13 | 1222222 |
| 14 | 2222222 |
| 15 | 12222222 |
| 16 | 22222222 |
| 17 | 122222222 |
| 18 | 222222222 |
| 19 | 1222222222 |
| 20 | 2222222222 |
| 21 | 12222222222 |
| 22 | 22222222222 |
| 23 | 122222222222 |
| 24 | 222222222222 |
| 25 | 1222222222222 |
| 26 | 2222222222222 |
| 27 | 12222222222222 |
[0,1,2,12,22,122,222,1222,2222,12222,22222,122222, 222222,1222222,2222222,12222222,22222222, 122222222,222222222,1222222222,2222222222, 12222222222,22222222222,122222222222,222222222222, 1222222222222,2222222222222,12222222222222] |