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A308162
as a simple table
n
a(n)
1
0
2
1
3
2
4
3
5
4
6
6
7
6
8
8
9
9
10
10
11
12
12
12
13
15
14
16
15
18
16
18
17
20
[0,1,2,3,4,6,6,8,9,10,12,12,15,16,18,18,20]