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A289672
as a simple table
n
a(n)
1
4
2
3
3
4
4
7
5
8
6
7
7
14
8
15
9
14
10
15
11
16
12
15
13
24
14
25
15
28
16
29
17
30
18
35
19
38
20
39
21
38
22
39
23
38
[4,3,4,7,8,7,14,15,14,15,16,15,24,25,28,29,30,35, 38,39,38,39,38]