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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 8 |
| 5 | -1 |
| 6 | 27 |
| 7 | 57 |
| 8 | -15 |
| 9 | 3 |
| 10 | 502 |
| 11 | 1292 |
| 12 | -528 |
| 13 | 212 |
| 14 | -38 |
| 15 | 2375 |
| 16 | 7135 |
| 17 | -3990 |
| 18 | 2410 |
| 19 | -865 |
| 20 | 135 |
[1,1,1,5,8,-1,27,57,-15,3,502,1292,-528,212,-38, 2375,7135,-3990,2410,-865,135] |