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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 7 |
| 5 | 9 |
| 6 | 13 |
| 7 | 33 |
| 8 | 37 |
| 9 | 76 |
| 10 | 147 |
| 11 | 297 |
| 12 | 1851 |
| 13 | 3457 |
| 14 | 3609 |
| 15 | 45219 |
[1,3,4,7,9,13,33,37,76,147,297,1851,3457,3609, 45219] |