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A140584
as a simple table
n
a(n)
1
1
2
3
3
5
4
6
5
9
6
10
7
13
8
12
9
15
10
18
11
21
12
20
13
25
14
26
[1,3,5,6,9,10,13,12,15,18,21,20,25,26]