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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 6 |
| 6 | 7 |
| 7 | 9 |
| 8 | 10 |
| 9 | 11 |
| 10 | 19 |
| 11 | 20 |
| 12 | 23 |
| 13 | 29 |
| 14 | 40 |
| 15 | 42 |
| 16 | 50 |
| 17 | 52 |
| 18 | 90 |
| 19 | 99 |
[0,2,3,4,6,7,9,10,11,19,20,23,29,40,42,50,52,90, 99] |