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| n | a(n) |
|---|---|
| 1 | 120 |
| 2 | 1120 |
| 3 | 1200 |
| 4 | 1220 |
| 5 | 11120 |
| 6 | 11200 |
| 7 | 11220 |
| 8 | 12000 |
| 9 | 12200 |
| 10 | 12220 |
| 11 | 111120 |
| 12 | 111200 |
| 13 | 111220 |
| 14 | 112000 |
| 15 | 112200 |
| 16 | 112220 |
| 17 | 120000 |
| 18 | 120120 |
| 19 | 122000 |
| 20 | 122200 |
| 21 | 122220 |
| 22 | 1111120 |
| 23 | 1111200 |
| 24 | 1111220 |
| 25 | 1112000 |
| 26 | 1112200 |
| 27 | 1112220 |
| 28 | 1120000 |
| 29 | 1120120 |
| 30 | 1122000 |
| 31 | 1122200 |
| 32 | 1122220 |
[120,1120,1200,1220,11120,11200,11220,12000,12200, 12220,111120,111200,111220,112000,112200,112220, 120000,120120,122000,122200,122220,1111120, 1111200,1111220,1112000,1112200,1112220,1120000, 1120120,1122000,1122200,1122220] |