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A005423
as a simple table
n
a(n)
0
1
1
2
2
3
3
4
4
5
5
6
6
8
7
10
8
11
9
14
10
20
11
21
12
35
13
56
[1,2,3,4,5,6,8,10,11,14,20,21,35,56]