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| n | a(n) |
|---|---|
| 1 | 15376544 |
| 2 | 3276916896 |
| 3 | 873499447968 |
| 4 | 242220624640736 |
| 5 | 68409320823594368 |
[15376544,3276916896,873499447968,242220624640736, 68409320823594368] |