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A369645
as a simple table
n
a(n)
1
1
2
2
3
8
4
32
5
256
6
2560
7
30720
8
32768
9
4194304
10
20971520
11
58720256
12
234881024
13
536870912
14
1342177280
[1,2,8,32,256,2560,30720,32768,4194304,20971520, 58720256,234881024,536870912,1342177280]