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A127399
as a simple table
n
a(n)
2
2
3
6
4
4
5
6
6
7
7
7
8
8
9
11
10
9
11
11
12
12
13
14
14
13
15
17
16
16
17
19
18
20
19
20
20
23
21
23
22
23
23
27
24
27
25
28
26
29
[2,6,4,6,7,7,8,11,9,11,12,14,13,17,16,19,20,20,23, 23,23,27,27,28,29]