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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 9 |
| 6 | 14 |
| 7 | 21 |
| 8 | 87 |
| 9 | 206 |
| 10 | 527 |
| 11 | 959 |
| 12 | 2099 |
| 13 | 18521 |
| 14 | 36782 |
| 15 | 38516 |
[0,2,3,5,9,14,21,87,206,527,959,2099,18521,36782, 38516] |