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A104075
as a simple table
n
a(n)
0
0
1
1
2
2
3
3
4
11
5
22
6
111
7
1111
8
11111
9
111111
10
1111111
11
11111111
12
111111111
[0,1,2,3,11,22,111,1111,11111,111111,1111111, 11111111,111111111]