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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 126 |
| 3 | 15498 |
| 4 | 9640008 |
| 5 | 32213930742 |
| 6 | 568826898735456 |
| 7 | 53598993642186546600 |
| 8 | 26904643609262481062550540 |
| 9 | 72104047201942444207678110553554 |
| 10 | 1031832360324996701256333234422715357000 |
[6,126,15498,9640008,32213930742,568826898735456, 53598993642186546600,26904643609262481062550540, 72104047201942444207678110553554, 1031832360324996701256333234422715357000] |