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A330431
as a simple table
n
a(n)
1
1
2
7
3
13
4
15
5
19
6
31
7
27
8
32
9
53
10
39
11
43
12
63
13
52
14
55
[1,7,13,15,19,31,27,32,53,39,43,63,52,55]