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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 3 |
| 5 | 2 |
| 6 | 5 |
| 7 | 12 |
| 8 | 16 |
| 9 | 30 |
| 10 | 45 |
| 11 | 94 |
| 12 | 159 |
| 13 | 285 |
| 14 | 477 |
| 15 | 864 |
| 16 | 1487 |
| 17 | 2643 |
[1,1,0,0,3,2,5,12,16,30,45,94,159,285,477,864, 1487,2643] |