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| n | a(n) |
|---|---|
| 20 | 654729075 |
| 21 | 59580345825 |
| 22 | 2924020048950 |
| 23 | 102811233675150 |
| 24 | 2903837588727075 |
| 25 | 70057683857786625 |
| 26 | 1499598592952460000 |
| 27 | 29215503851264230500 |
| 28 | 527544117129699920250 |
| 29 | 8948695357270547228350 |
| 30 | 144075089938915244609500 |
| 31 | 2219478078319305088785500 |
[654729075,59580345825,2924020048950, 102811233675150,2903837588727075, 70057683857786625,1499598592952460000, 29215503851264230500,527544117129699920250, 8948695357270547228350,144075089938915244609500, 2219478078319305088785500] |