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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 8 |
| 9 | 9 |
| 10 | 20 |
| 11 | 31 |
| 12 | 42 |
| 13 | 53 |
| 14 | 64 |
| 15 | 75 |
| 16 | 86 |
| 17 | 97 |
| 18 | 420 |
| 19 | 531 |
| 20 | 642 |
| 21 | 753 |
| 22 | 864 |
| 23 | 975 |
| 24 | 6420 |
| 25 | 7531 |
| 26 | 8642 |
| 27 | 9753 |
| 28 | 86420 |
| 29 | 97531 |
[1,2,3,4,5,6,7,8,9,20,31,42,53,64,75,86,97,420, 531,642,753,864,975,6420,7531,8642,9753,86420, 97531] |