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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 11 |
| 6 | 22 |
| 7 | 40 |
| 8 | 72 |
| 9 | 120 |
| 10 | 203 |
| 11 | 331 |
| 12 | 526 |
| 13 | 828 |
| 14 | 1277 |
| 15 | 1947 |
| 16 | 2931 |
| 17 | 4372 |
[0,1,2,6,11,22,40,72,120,203,331,526,828,1277, 1947,2931,4372] |