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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 10 |
| 7 | 18 |
| 8 | 34 |
| 9 | 55 |
| 10 | 104 |
| 11 | 176 |
| 12 | 320 |
| 13 | 592 |
| 14 | 1071 |
| 15 | 1855 |
| 16 | 3311 |
| 17 | 5943 |
| 18 | 10231 |
[1,2,3,6,10,18,34,55,104,176,320,592,1071,1855, 3311,5943,10231] |