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A003889
as a simple table
n
a(n)
1
1
2
13
3
13
4
26
5
26
6
26
7
26
8
26
9
26
10
27
11
28
12
28
13
28
14
28
15
28
16
28
[1,13,13,26,26,26,26,26,26,27,28,28,28,28,28,28]