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A171551
as a simple table
n
a(n)
0
0
1
1
2
2
3
3
4
4
5
7
6
8
7
9
8
10
9
12
10
13
11
15
12
18
13
20
14
21
15
22
16
23
17
24
18
26
19
27
20
29
21
37
22
50
[0,1,2,3,4,7,8,9,10,12,13,15,18,20,21,22,23,24,26, 27,29,37,50]