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A234349
as a simple table
n
a(n)
1
1
2
3
3
4
4
6
5
7
6
8
7
10
8
11
9
12
10
13
11
15
12
16
13
17
14
19
15
20
16
22
17
23
18
24
19
25
20
27
21
28
[1,3,4,6,7,8,10,11,12,13,15,16,17,19,20,22,23,24, 25,27,28]