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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 70 |
| 3 | 25446 |
| 4 | 29416791 |
| 5 | 83400344760 |
| 6 | 492319974701196 |
| 7 | 5405431813676888595 |
| 8 | 101632942861784833336188 |
[1,70,25446,29416791,83400344760,492319974701196, 5405431813676888595,101632942861784833336188] |