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A072868
as a simple table
n
a(n)
1
4
2
8
3
32
4
128
5
8192
6
131072
7
524288
8
2147483648
9
2305843009213693952
10
618970019642690137449562112
[4,8,32,128,8192,131072,524288,2147483648, 2305843009213693952,618970019642690137449562112]