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A285634
as a simple table
n
a(n)
1
4
2
8
3
64
4
2097152
5
3450873173395281893717377931138512726225554486085193277581262111899648
[4,8,64,2097152, 34508731733952818937173779311385127262255544860851\ 93277581262111899648]