A215940 - OEIS

A215940 as a simple table

n	a(n)
1	0
2	1
3	10
4	12
5	21
6	22
7	100
8	101
9	120
10	123
11	131
12	133
13	210
14	212
15	220
16	223
17	242
18	243
19	321
20	322
21	331
22	333
23	342
24	343
25	1000
26	1001
27	1010
28	1012
29	1021
30	1022
31	1200
32	1201
33	1230
34	1234
35	1241
36	1244
37	1310
38	1312
39	1330
40	1334
41	1352
42	1354
43	1421
44	1422
45	1441
46	1444
47	1452
48	1454
49	2100

[0,1,10,12,21,22,100,101,120,123,131,133,210,212, 220,223,242,243,321,322,331,333,342,343,1000,1001, 1010,1012,1021,1022,1200,1201,1230,1234,1241,1244, 1310,1312,1330,1334,1352,1354,1421,1422,1441,1444, 1452,1454,2100]