A169683 - OEIS

A169683 as a simple table

n	a(n)
0	0
1	1
2	2
3	10
4	11
5	12
6	20
7	100
8	101
9	102
10	110
11	111
12	112
13	120
14	200
15	1000
16	1001
17	1002
18	1010
19	1011
20	1012
21	1020
22	1100
23	1101
24	1102
25	1110
26	1111
27	1112
28	1120
29	1200
30	2000
31	10000
32	10001
33	10002
34	10010
35	10011
36	10012
37	10020
38	10100
39	10101
40	10102
41	10110

[0,1,2,10,11,12,20,100,101,102,110,111,112,120, 200,1000,1001,1002,1010,1011,1012,1020,1100,1101, 1102,1110,1111,1112,1120,1200,2000,10000,10001, 10002,10010,10011,10012,10020,10100,10101,10102, 10110]