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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 9 |
| 3 | 64 |
| 4 | 615 |
| 5 | 7584 |
| 6 | 114205 |
| 7 | 2031072 |
| 8 | 41651631 |
| 9 | 967466240 |
| 10 | 25102071621 |
| 11 | 719516990160 |
| 12 | 22578674361815 |
| 13 | 769853562649248 |
| 14 | 28340118309069645 |
| 15 | 1120229004620264896 |
| 16 | 47322526714956795615 |
| 17 | 2127582051231624604416 |
[2,9,64,615,7584,114205,2031072,41651631, 967466240,25102071621,719516990160,22578674361815, 769853562649248,28340118309069645, 1120229004620264896,47322526714956795615, 2127582051231624604416] |