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A080781
as a simple table
n
a(n)
1
1
2
5
3
9
4
13
5
12
6
16
7
20
8
24
9
23
10
27
11
31
12
30
13
29
14
33
15
37
16
36
17
40
18
44
19
48
20
47
21
51
22
55
23
54
[1,5,9,13,12,16,20,24,23,27,31,30,29,33,37,36,40, 44,48,47,51,55,54]