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A005137
as a simple table
n
a(n)
0
0
1
2
2
2
3
2
4
4
5
2
6
4
7
4
8
4
9
4
10
4
11
6
12
8
13
6
14
6
15
6
16
8
17
6
18
8
19
8
20
8
21
8
22
8
23
10
24
12
25
10
26
10
27
10
28
12
29
10
30
12
[0,2,2,2,4,2,4,4,4,4,4,6,8,6,6,6,8,6,8,8,8,8,8,10, 12,10,10,10,12,10,12]