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A272669
as a simple table
n
a(n)
0
0
1
1
2
2
3
3
4
5
5
8
6
10
7
11
8
12
9
13
10
14
11
15
12
16
13
18
[0,1,2,3,5,8,10,11,12,13,14,15,16,18]