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A003890
as a simple table
n
a(n)
1
1
2
15
3
15
4
28
5
28
6
28
7
28
8
28
9
28
10
28
11
29
12
30
13
30
14
30
15
30
16
30
17
30
[1,15,15,28,28,28,28,28,28,28,29,30,30,30,30,30, 30]