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A159952 as a simple table

na(n)
10
21
32
410
511
612
720
821
922
10100
11101
12102
13110
14111
15112
16120
17121
18122
19200
20201
21202
22210
23211
24212
25220
26221
271000
281001
291002
301010
311011
321012
331020
341021
351022
361100
371101
381102
391110
401111
411112
421120
431121
441122
451200
461201
471202
481210
491211
501212

[0,1,2,10,11,12,20,21,22,100,101,102,110,111,112,
 120,121,122,200,201,202,210,211,212,220,221,1000,
 1001,1002,1010,1011,1012,1020,1021,1022,1100,1101,
 1102,1110,1111,1112,1120,1121,1122,1200,1201,1202,
 1210,1211,1212]