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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 7 |
| 3 | 58 |
| 4 | 5005 |
| 5 | 17866792 |
| 6 | 376849528799811 |
| 7 | 200293775046575062138461261536 |
| 8 | 32943134937280084367481102479381536199595464025076702877604 |
[2,7,58,5005,17866792,376849528799811, 200293775046575062138461261536, 32943134937280084367481102479381536199595464025076\ 702877604] |