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A182989
as a simple table
n
a(n)
1
1
2
4
3
7
4
12
5
15
6
20
7
24
8
31
9
34
10
39
11
43
12
50
13
53
14
59
15
64
16
75
17
78
18
83
19
89
[1,4,7,12,15,20,24,31,34,39,43,50,53,59,64,75,78, 83,89]