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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 73 |
| 4 | 2957 |
| 5 | 431805 |
| 6 | 193413963 |
| 7 | 198914729182 |
| 8 | 389238347659505 |
| 9 | 1292594846197639190 |
| 10 | 6753309741099683530616 |
[1,6,73,2957,431805,193413963,198914729182, 389238347659505,1292594846197639190, 6753309741099683530616] |