A231869 - OEIS

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A231869 as a simple table

n	a(n)
1	1
2	12
3	122
4	123
5	1222
6	1223
7	1232
8	1233
9	1234
10	12222
11	12223
12	12232
13	12233
14	12234
15	12322
16	12323
17	12332
18	12333
19	12334
20	12342
21	12343
22	12344
23	12345

[1,12,122,123,1222,1223,1232,1233,1234,12222, 12223,12232,12233,12234,12322,12323,12332,12333, 12334,12342,12343,12344,12345]