A157900 - OEIS

A157900 as a simple table

n	a(n)
1	1
2	2
3	3
4	12
5	13
6	22
7	23
8	300
9	101
10	102
11	103
12	112
13	113
14	122
15	123
16	223
17	323
18	1112
19	1113
20	1122
21	1123
22	1223
23	1323
24	2323
25	3323
26	12323
27	13323
28	22323
29	23323
30	101223
31	101323
32	102323
33	103323
34	112323
35	113323
36	122323
37	123323
38	223323
39	323323
40	1113323
41	1122323
42	1123323
43	1223323
44	1323323

[1,2,3,12,13,22,23,300,101,102,103,112,113,122, 123,223,323,1112,1113,1122,1123,1223,1323,2323, 3323,12323,13323,22323,23323,101223,101323,102323, 103323,112323,113323,122323,123323,223323,323323, 1113323,1122323,1123323,1223323,1323323]