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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | -1 |
| 3 | -7 |
| 4 | -60 |
| 5 | -1210 |
| 6 | -34020 |
| 7 | -607332 |
| 8 | -30448441 |
| 9 | -1093612784 |
| 10 | -55400732937 |
| 11 | -2471079070511 |
| 12 | -197500419383964 |
[1,0,-1,-7,-60,-1210,-34020,-607332,-30448441, -1093612784,-55400732937,-2471079070511, -197500419383964] |