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A251533
as a simple table
n
a(n)
1
1
2
3
3
6
4
7
5
7
6
9
7
15
8
18
9
21
10
21
11
27
12
31
13
37
14
42
15
44
16
49
17
56
18
63
19
70
[1,3,6,7,7,9,15,18,21,21,27,31,37,42,44,49,56,63, 70]