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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 12 |
| 5 | 15 |
| 6 | 19 |
| 7 | 20 |
| 8 | 26 |
| 9 | 50 |
| 10 | 55 |
| 11 | 66 |
| 12 | 68 |
| 13 | 96 |
| 14 | 99 |
| 15 | 150 |
| 16 | 166 |
| 17 | 228 |
| 18 | 459 |
[1,2,6,12,15,19,20,26,50,55,66,68,96,99,150,166, 228,459] |