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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 8 |
| 3 | 64 |
| 4 | 2097152 |
| 5 | 3450873173395281893717377931138512726225554486085193277581262111899648 |
[4,8,64,2097152, 34508731733952818937173779311385127262255544860851\ 93277581262111899648] |