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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 35 |
| 4 | 105 |
| 5 | 168 |
| 6 | 280 |
| 7 | 435 |
| 8 | 435 |
| 9 | 280 |
| 10 | 168 |
| 11 | 105 |
| 12 | 35 |
| 13 | 0 |
| 14 | 0 |
| 15 | 1 |
[1,0,0,35,105,168,280,435,435,280,168,105,35,0,0, 1] |