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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | -90 |
| 4 | -2520 |
| 5 | -126630 |
| 6 | -2243340 |
| 7 | 382612230 |
| 8 | 134674853040 |
| 9 | 26271944587890 |
| 10 | 4394379581092620 |
| 11 | 324925984573170750 |
| 12 | -181350289825568364600 |
| 13 | -145875833202121504544790 |
[1,0,0,-90,-2520,-126630,-2243340,382612230, 134674853040,26271944587890,4394379581092620, 324925984573170750,-181350289825568364600, -145875833202121504544790] |