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A306105 as a simple table

na(n)
10
21
32
410
520
621
7101
8102
9201
10202
11212
121010
131020
141021
152010
162020
172021
182120
192121
2010101
2110102
2210201
2310202
2410212
2520101
2620102
2720201
2820202
2920212
3021201
3121202
3221212
33101010
34101020
35101021
36102010
37102020
38102021
39102120
40102121

[0,1,2,10,20,21,101,102,201,202,212,1010,1020,
 1021,2010,2020,2021,2120,2121,10101,10102,10201,
 10202,10212,20101,20102,20201,20202,20212,21201,
 21202,21212,101010,101020,101021,102010,102020,
 102021,102120,102121]