A125098 - OEIS

A125098 as a simple table

n	a(n)
0	0
1	1
2	10
3	11
4	12
5	100
6	101
7	102
8	110
9	111
10	112
11	120
12	121
13	122
14	123
15	1000
16	1001
17	1002
18	1010
19	1011
20	1012
21	1020
22	1021
23	1022
24	1023
25	1100
26	1101
27	1102
28	1110
29	1111
30	1112
31	1120
32	1121
33	1122
34	1123
35	1200
36	1201
37	1202
38	1203
39	1210
40	1211
41	1212
42	1213
43	1220
44	1221
45	1222

[0,1,10,11,12,100,101,102,110,111,112,120,121,122, 123,1000,1001,1002,1010,1011,1012,1020,1021,1022, 1023,1100,1101,1102,1110,1111,1112,1120,1121,1122, 1123,1200,1201,1202,1203,1210,1211,1212,1213,1220, 1221,1222]