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A121150
as a simple table
n
a(n)
1
4
2
6
3
8
4
9
5
11
6
12
7
14
8
15
9
16
10
18
11
19
12
20
13
22
14
23
15
24
16
25
17
27
18
28
[4,6,8,9,11,12,14,15,16,18,19,20,22,23,24,25,27, 28]