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A109827 as a simple table

na(n)
00
11
210
311
420
521
6100
7101
8110
9111
10120
11121
121000
131001
141010
151011
161020
171021
181100
191101
201110
211111
221120
231121
242000
252001
262010
272011
282020
292021
302100
312101
322110
332111
342120
352121
3610000
3710001
3810010
3910011
4010020
4110021
4210100
4310101

[0,1,10,11,20,21,100,101,110,111,120,121,1000,
 1001,1010,1011,1020,1021,1100,1101,1110,1111,1120,
 1121,2000,2001,2010,2011,2020,2021,2100,2101,2110,
 2111,2120,2121,10000,10001,10010,10011,10020,
 10021,10100,10101]