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A049345 as a simple table

na(n)
00
11
210
311
420
521
6100
7101
8110
9111
10120
11121
12200
13201
14210
15211
16220
17221
18300
19301
20310
21311
22320
23321
24400
25401
26410
27411
28420
29421
301000
311001
321010
331011
341020
351021
361100
371101
381110
391111
401120
411121
421200
431201
441210
451211
461220
471221
481300
491301
501310
511311

[0,1,10,11,20,21,100,101,110,111,120,121,200,201,
 210,211,220,221,300,301,310,311,320,321,400,401,
 410,411,420,421,1000,1001,1010,1011,1020,1021,
 1100,1101,1110,1111,1120,1121,1200,1201,1210,1211,
 1220,1221,1300,1301,1310,1311]