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| n | a(n) |
|---|---|
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 0 |
| 7 | 4 |
| 8 | 0 |
| 9 | -1 |
| 10 | 0 |
| 11 | 28 |
| 12 | -1 |
| 13 | -118 |
| 14 | 294 |
| 15 | -184 |
| 16 | -441 |
| 17 | 1486 |
| 18 | -273 |
| 19 | -6464 |
| 20 | 8969 |
[0,0,1,0,0,4,0,-1,0,28,-1,-118,294,-184,-441,1486, -273,-6464,8969] |