A074158 - OEIS

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A074158 as a simple table

n	a(n)
1	1
2	12
3	123
4	12340
5	12345
6	123456
7	12345676
8	123456784
9	123456789
10	12345678910
11	12345678910114
12	123456789101112
13	1234567891011121303
14	12345678910111213142
15	123456789101112131415
16	123456789101112131415168

[1,12,123,12340,12345,123456,12345676,123456784, 123456789,12345678910,12345678910114, 123456789101112,1234567891011121303, 12345678910111213142,123456789101112131415, 123456789101112131415168]