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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 0 |
| 5 | -9 |
| 6 | -64 |
| 7 | -348 |
| 8 | -1672 |
| 9 | -7307 |
| 10 | -28225 |
| 11 | -81817 |
| 12 | 14191 |
| 13 | 3143571 |
| 14 | 38184875 |
| 15 | 353727284 |
| 16 | 2916494333 |
| 17 | 22260343389 |
| 18 | 157677357255 |
| 19 | 1007259846130 |
| 20 | 5241783274713 |
| 21 | 12146415146776 |
| 22 | -210638381350012 |
| 23 | -4813155361775252 |
[0,1,1,1,0,-9,-64,-348,-1672,-7307,-28225,-81817, 14191,3143571,38184875,353727284,2916494333, 22260343389,157677357255,1007259846130, 5241783274713,12146415146776,-210638381350012, -4813155361775252] |