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A014418 as a simple table

na(n)
00
11
210
311
420
5100
6101
7110
8111
9120
10200
11201
12210
13211
141000
151001
161010
171011
181020
191100
201101
211110
221111
231120
241200
251201
261210
271211
282000
292001
302010
312011
322020
332100
342101
352110
362111
372120
382200
392201
402210
412211
4210000

[0,1,10,11,20,100,101,110,111,120,200,201,210,211,
 1000,1001,1010,1011,1020,1100,1101,1110,1111,1120,
 1200,1201,1210,1211,2000,2001,2010,2011,2020,2100,
 2101,2110,2111,2120,2200,2201,2210,2211,10000]