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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 5 |
| 3 | -109 |
| 4 | 4521 |
| 5 | -330681 |
| 6 | 36468717 |
| 7 | -5721101541 |
| 8 | 1205289090513 |
| 9 | -328897528901361 |
| 10 | 112769846051251797 |
| 11 | -47472161654530776285 |
| 12 | 24068680135210975714425 |
| 13 | -14466929567049590650593705 |
[1,-1,5,-109,4521,-330681,36468717,-5721101541, 1205289090513,-328897528901361,112769846051251797, -47472161654530776285,24068680135210975714425, -14466929567049590650593705] |