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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 111 |
| 3 | 1002 |
| 4 | 12021 |
| 5 | 111222 |
| 6 | 1001001 |
| 7 | 12012012 |
| 8 | 111111111 |
| 9 | 1000000002 |
| 10 | 12000000021 |
| 11 | 111000000222 |
| 12 | 1002000002001 |
| 13 | 12021000021012 |
| 14 | 111222000222111 |
| 15 | 1001001002002002 |
| 16 | 12012012021021021 |
| 17 | 111111111222222222 |
| 18 | 1000000001000000001 |
| 19 | 12000000012000000012 |
| 20 | 111000000111000000111 |
[1,12,111,1002,12021,111222,1001001,12012012, 111111111,1000000002,12000000021,111000000222, 1002000002001,12021000021012,111222000222111, 1001001002002002,12012012021021021, 111111111222222222,1000000001000000001, 12000000012000000012,111000000111000000111] |