A071269 - OEIS

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A071269 as a simple table

n	a(n)
1	1
2	12
3	123
4	12345
5	123456
6	123456789
7	12345678910
8	123456789101112
9	123456789101112131415
10	123456789101112131415161718
11	1234567891011121314151617181920
12	12345678910111213141516171819202122232425

[1,12,123,12345,123456,123456789,12345678910, 123456789101112,123456789101112131415, 123456789101112131415161718, 1234567891011121314151617181920, 12345678910111213141516171819202122232425]