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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 7 |
| 5 | 13 |
| 6 | 15 |
| 7 | 39 |
| 8 | 43 |
| 9 | 54 |
| 10 | 1227 |
| 11 | 1796 |
| 12 | 2674 |
| 13 | 3464 |
| 14 | 6057 |
| 15 | 7650 |
| 16 | 17083 |
[1,2,3,4,7,13,15,39,43,54,1227,1796,2674,3464, 6057,7650,17083] |