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A200066
as a simple table
n
a(n)
1
3
2
4
3
5
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
11
12
13
13
17
14
19
15
19
16
21
[3,4,5,5,6,7,8,9,10,11,11,13,17,19,19,21]