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A028828
as a simple table
n
a(n)
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
14
13
15
14
18
15
20
16
21
17
22
18
23
19
24
20
30
[1,2,3,4,5,6,7,8,9,10,11,12,14,15,18,20,21,22,23, 24,30]