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A108039
as a simple table
n
a(n)
0
2
1
4
2
4
3
4
4
8
5
8
6
8
7
8
8
10
9
12
10
12
11
16
12
16
13
16
14
16
15
16
16
18
17
20
[2,4,4,4,8,8,8,8,10,12,12,16,16,16,16,16,18,20]