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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 181 |
| 4 | 11584 |
| 5 | 1434176 |
| 6 | 311510016 |
| 7 | 106474687488 |
| 8 | 54515039993856 |
| 9 | 39741464155521024 |
| 10 | 39789248881360896000 |
| 11 | 52911705535251480576000 |
| 12 | 91431427164914558435328000 |
| 13 | 200764942140996806158319616000 |
[1,7,181,11584,1434176,311510016,106474687488, 54515039993856,39741464155521024, 39789248881360896000,52911705535251480576000, 91431427164914558435328000, 200764942140996806158319616000] |