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A137595
as a simple table
n
a(n)
1
1
2
3
3
6
4
7
5
13
6
15
7
25
8
26
9
28
10
31
11
49
12
53
13
59
14
63
[1,3,6,7,13,15,25,26,28,31,49,53,59,63]
