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A028931 as a simple table

na(n)
00
11
220
321
4310
5311
64200
74201
84220
94221
1053110
1153111
12642000
13642001
14642020
15642021
16642310
17642311
187531200
197531201
207531220
217531221
2286420110
2386420111
2486424000
2586424001
2686424020
2786424021
2886424310
2986424311

[0,1,20,21,310,311,4200,4201,4220,4221,53110,
 53111,642000,642001,642020,642021,642310,642311,
 7531200,7531201,7531220,7531221,86420110,86420111,
 86424000,86424001,86424020,86424021,86424310,
 86424311]