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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 57 |
| 4 | 700 |
| 5 | 10677 |
| 6 | 193676 |
| 7 | 4054358 |
| 8 | 95534880 |
| 9 | 2472405340 |
| 10 | 68613576496 |
| 11 | 1999809519672 |
| 12 | 60231323048000 |
| 13 | 1853103730499696 |
| 14 | 57790053276242496 |
| 15 | 1817609007303894496 |
| 16 | 57472115932658904064 |
| 17 | 1823283879810883824576 |
[2,6,57,700,10677,193676,4054358,95534880, 2472405340,68613576496,1999809519672, 60231323048000,1853103730499696,57790053276242496, 1817609007303894496,57472115932658904064, 1823283879810883824576] |