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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 20 |
| 4 | 200 |
| 5 | 202 |
| 6 | 2000 |
| 7 | 2002 |
| 8 | 2020 |
| 9 | 20000 |
| 10 | 20002 |
| 11 | 20020 |
| 12 | 20200 |
| 13 | 200000 |
| 14 | 200002 |
| 15 | 200020 |
| 16 | 200200 |
| 17 | 202000 |
| 18 | 2000000 |
| 19 | 2000002 |
| 20 | 2000020 |
| 21 | 2000200 |
| 22 | 2002000 |
| 23 | 2020000 |
| 24 | 20000000 |
| 25 | 20000002 |
| 26 | 20000020 |
| 27 | 20000200 |
| 28 | 20000202 |
| 29 | 20002000 |
| 30 | 20002002 |
| 31 | 20020000 |
[0,2,20,200,202,2000,2002,2020,20000,20002,20020, 20200,200000,200002,200020,200200,202000,2000000, 2000002,2000020,2000200,2002000,2020000,20000000, 20000002,20000020,20000200,20000202,20002000, 20002002,20020000] |