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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | -58266480 |
| 9 | 3677897920745140 |
| 10 | -230677643550873536294640 |
| 11 | 14475186854407942097510802411322 |
| 12 | -908294062111964496034866469968025332240 |
[1,-58266480,3677897920745140, -230677643550873536294640, 14475186854407942097510802411322, -908294062111964496034866469968025332240] |