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A069538
as a simple table
n
a(n)
0
3
1
12
2
21
3
30
4
102
5
111
6
120
7
201
8
210
9
300
10
1002
11
1011
12
1020
13
1101
14
1110
15
1200
16
2001
[3,12,21,30,102,111,120,201,210,300,1002,1011, 1020,1101,1110,1200,2001]