A212556 - OEIS

A212556 as a simple table

n	a(n)
1	0
2	1
3	2
4	3
5	100
6	101
7	102
8	103
9	110
10	111
11	112
12	113
13	120
14	121
15	122
16	123
17	130
18	131
19	132
20	133
21	200
22	201
23	202
24	203
25	210
26	211
27	212
28	213
29	220
30	221
31	222
32	223
33	230
34	231
35	232
36	233
37	300
38	301
39	302
40	303
41	310
42	311
43	312
44	313
45	320
46	321
47	322
48	323
49	330
50	331
51	332
52	333
53	10000

[0,1,2,3,100,101,102,103,110,111,112,113,120,121, 122,123,130,131,132,133,200,201,202,203,210,211, 212,213,220,221,222,223,230,231,232,233,300,301, 302,303,310,311,312,313,320,321,322,323,330,331, 332,333,10000]