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A074097
as a simple table
n
a(n)
1
2
2
4
3
13
4
15
5
21
6
22
7
23
8
27
9
29
10
34
11
36
12
40
13
42
14
50
15
75
16
81
[2,4,13,15,21,22,23,27,29,34,36,40,42,50,75,81]
