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A005410
as a simple table
n
a(n)
1
1
2
2
3
3
4
3
5
4
6
4
7
5
8
5
9
6
10
6
11
7
12
7
13
8
14
8
15
9
16
9
17
9
18
10
[1,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,9,10]