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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | -3 |
| 3 | -4 |
| 4 | 3 |
| 5 | 12 |
| 6 | 5 |
| 7 | -12 |
| 8 | -18 |
| 9 | 0 |
| 10 | 18 |
| 11 | 12 |
| 12 | -5 |
| 13 | -12 |
| 14 | -3 |
| 15 | 4 |
| 16 | 3 |
| 17 | 0 |
| 18 | -1 |
[1,0,-3,-4,3,12,5,-12,-18,0,18,12,-5,-12,-3,4,3,0, -1] |