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A193838
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
9
9
10
10
11
11
13
12
15
13
16
14
18
[1,2,3,4,5,6,7,9,10,11,13,15,16,18]
