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A352923
as a simple table
n
a(n)
1
1
2
2
3
4
4
4
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
14
13
14
14
16
15
18
16
18
17
18
18
20
[1,2,4,4,6,7,8,9,10,11,12,14,14,16,18,18,18,20]