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A055569
as a simple table
n
a(n)
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
12
11
13
12
14
13
15
14
16
15
17
16
18
17
19
18
26
19
27
[0,1,2,3,4,5,6,7,8,9,12,13,14,15,16,17,18,19,26, 27]