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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 6 |
| 6 | 9 |
| 7 | 12 |
| 8 | 13 |
| 9 | 18 |
| 10 | 26 |
| 11 | 36 |
| 12 | 39 |
| 13 | 52 |
| 14 | 78 |
| 15 | 117 |
| 16 | 156 |
| 17 | 234 |
| 18 | 468 |
[1,2,3,4,6,9,12,13,18,26,36,39,52,78,117,156,234, 468] |