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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | -1 |
| 4 | -3 |
| 5 | -6 |
| 6 | -28 |
| 7 | -36 |
| 8 | -360 |
| 9 | -203 |
| 10 | -4362 |
| 11 | 4626 |
| 12 | -54347 |
| 13 | 105309 |
[1,0,0,-1,-3,-6,-28,-36,-360,-203,-4362,4626, -54347,105309] |