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A173900
as a simple table
n
a(n)
1
1
2
10
3
11
4
22
5
100
6
101
7
110
8
111
9
113
10
122
11
202
12
220
13
221
14
222
15
242
[1,10,11,22,100,101,110,111,113,122,202,220,221, 222,242]