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A028931 as a simple table

n a(n)
0 0
1 1
2 20
3 21
4 310
5 311
6 4200
7 4201
8 4220
9 4221
10 53110
11 53111
12 642000
13 642001
14 642020
15 642021
16 642310
17 642311
18 7531200
19 7531201
20 7531220
21 7531221
22 86420110
23 86420111
24 86424000
25 86424001
26 86424020
27 86424021
28 86424310
29 86424311

[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]

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Last modified February 20 15:20 EST 2019. Contains 320336 sequences. (Running on oeis4.)