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A126969
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
11
11
12
12
13
13
21
14
111
15
311
16
2111
17
11111
18
11112
19
11113
20
11114
21
31111
[0,1,2,3,4,5,6,7,8,9,11,12,13,21,111,311,2111, 11111,11112,11113,11114,31111]