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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 12 |
| 4 | 15 |
| 5 | 16 |
| 6 | 17 |
| 7 | 31 |
| 8 | 32 |
| 9 | 45 |
| 10 | 49 |
| 11 | 56 |
| 12 | 60 |
| 13 | 65 |
| 14 | 71 |
| 15 | 72 |
| 16 | 77 |
| 17 | 80 |
| 18 | 81 |
[1,7,12,15,16,17,31,32,45,49,56,60,65,71,72,77,80, 81] |