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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 64 |
| 3 | 65536 |
| 4 | 1073741824 |
| 5 | 309485009821345068724781056 |
| 6 | 85070591730234615865843651857942052864 |
[4,64,65536,1073741824, 309485009821345068724781056, 85070591730234615865843651857942052864] |