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A064039 as a simple table

na(n)
10
21
310
411
521
620
7100
8101
9110
10111
11121
12120
13210
14211
15200
16201
17220
18221
19311
20310
21321
22320
23301
24300
251000
261001
271010
281011
291021
301020
311100
321101
331110
341111
351121
361120
371210
381211
391200
401201
411220
421221
431311
441310
451321
461320
471301
481300

[0,1,10,11,21,20,100,101,110,111,121,120,210,211,
 200,201,220,221,311,310,321,320,301,300,1000,1001,
 1010,1011,1021,1020,1100,1101,1110,1111,1121,1120,
 1210,1211,1200,1201,1220,1221,1311,1310,1321,1320,
 1301,1300]