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A112648
as a simple table
n
a(n)
1
2
2
4
3
7
4
8
5
11
6
12
7
14
8
15
9
16
10
20
11
28
12
29
13
31
14
32
15
34
16
40
17
41
18
42
19
45
[2,4,7,8,11,12,14,15,16,20,28,29,31,32,34,40,41, 42,45]