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| n | a(n) |
|---|---|
| 3 | 31 |
| 4 | 1261 |
| 5 | 9979201 |
| 6 | 1556755201 |
| 7 | 88921857024001 |
| 8 | 30411275102208001 |
| 9 | 6463004184721244160001 |
| 10 | 2210440498434925488635904000001 |
| 11 | 2055709663544480704431390720000001 |
[31,1261,9979201,1556755201,88921857024001, 30411275102208001,6463004184721244160001, 2210440498434925488635904000001, 2055709663544480704431390720000001] |