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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 5 |
| 4 | 7 |
| 5 | 8 |
| 6 | 13 |
| 7 | 16 |
| 8 | 30 |
| 9 | 43 |
| 10 | 49 |
| 11 | 91 |
| 12 | 119 |
| 13 | 213 |
| 14 | 1380 |
| 15 | 1637 |
| 16 | 2258 |
| 17 | 4647 |
| 18 | 9701 |
| 19 | 12258 |
[2,4,5,7,8,13,16,30,43,49,91,119,213,1380,1637, 2258,4647,9701,12258] |