A105116 - OEIS

A105116 as a simple table

n	a(n)
0	0
1	1
2	2
3	10
4	11
5	12
6	20
7	21
8	100
9	101
10	102
11	110
12	111
13	120
14	121
15	200
16	201
17	202
18	210
19	211
20	212
21	1000
22	1001
23	1010
24	1011
25	1012
26	1020
27	1021
28	1100
29	1101
30	1102
31	1110
32	1111
33	1120
34	1121
35	1200
36	1201
37	1202
38	1210
39	1211
40	1212
41	2000
42	2001
43	2010
44	2011
45	2012
46	2020

[0,1,2,10,11,12,20,21,100,101,102,110,111,120,121, 200,201,202,210,211,212,1000,1001,1010,1011,1012, 1020,1021,1100,1101,1102,1110,1111,1120,1121,1200, 1201,1202,1210,1211,1212,2000,2001,2010,2011,2012, 2020]