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| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 6524 |
| 3 | 2807505 |
| 4 | 1928517786 |
| 5 | 662075303107 |
| 6 | 474459483232672 |
| 7 | 159780846921127290 |
| 8 | 118321716926292008569 |
[20,6524,2807505,1928517786,662075303107, 474459483232672,159780846921127290, 118321716926292008569] |