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A136816 as a simple table

na(n)
10
21
32
410
511
612
720
821
9100
10101
11102
12110
13120
14200
15201
16210
171000
181001
191002
201010
211011
221012
231020
241021
251100
261101
271102
281200
291201
302000
312001
322010
332011
342100
352101
3610000
3710001
3810002
3910010
4010011
4110012
4210020
4310021
4410100
4510110
4610120
4710200
4810210
4911000
5011001
5111002
5211010
5311011
5411020
5512000
5612001
5712010
5820000
5920001

[0,1,2,10,11,12,20,21,100,101,102,110,120,200,201,
 210,1000,1001,1002,1010,1011,1012,1020,1021,1100,
 1101,1102,1200,1201,2000,2001,2010,2011,2100,2101,
 10000,10001,10002,10010,10011,10012,10020,10021,
 10100,10110,10120,10200,10210,11000,11001,11002,
 11010,11011,11020,12000,12001,12010,20000,20001]