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A008839
as a simple table
n
a(n)
1
0
2
1
3
2
4
3
5
4
6
5
7
6
8
7
9
9
10
10
11
11
12
17
13
18
14
30
15
33
16
58
[0,1,2,3,4,5,6,7,9,10,11,17,18,30,33,58]