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A347167
as a simple table
n
a(n)
1
2
2
3
3
4
4
5
5
6
6
16
7
17
8
256
9
257
10
65536
11
65537
12
4294967296
[2,3,4,5,6,16,17,256,257,65536,65537,4294967296]