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| n | a(n) |
|---|---|
| 2 | 1431655765 |
| 3 | 65745948074080 |
| 4 | 3162178031998196717 |
| 5 | 156408973727702579374000 |
[1431655765,65745948074080,3162178031998196717, 156408973727702579374000] |