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A119931
as a simple table
n
a(n)
0
1
1
2
2
3
3
4
4
6
5
7
6
8
7
10
8
11
9
12
10
13
11
15
12
18
13
20
14
21
15
22
16
24
17
27
18
28
19
29
20
30
[1,2,3,4,6,7,8,10,11,12,13,15,18,20,21,22,24,27, 28,29,30]