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A256437 as a simple table

na(n)
10
21
32
410
511
612
720
821
930
10100
11101
12102
13110
14111
15120
16200
17201
18210
19220
20300
21310
221000
231001
241002
251010
261011
271012
281020
291021
301022
311100
321101
331102
341110
351111
361120
371200
381201
391210
401300
412000
422001
432010
442011
452100
462101
472110
482200
492201

[0,1,2,10,11,12,20,21,30,100,101,102,110,111,120,
 200,201,210,220,300,310,1000,1001,1002,1010,1011,
 1012,1020,1021,1022,1100,1101,1102,1110,1111,1120,
 1200,1201,1210,1300,2000,2001,2010,2011,2100,2101,
 2110,2200,2201]