A019524 - OEIS

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A019524 as a simple table

n	a(n)
1	11
2	1212
3	123123
4	12341234
5	1234512345
6	123456123456
7	12345671234567
8	1234567812345678
9	123456789123456789
10	1234567891012345678910
11	12345678910111234567891011
12	123456789101112123456789101112

[11,1212,123123,12341234,1234512345,123456123456, 12345671234567,1234567812345678, 123456789123456789,1234567891012345678910, 12345678910111234567891011, 123456789101112123456789101112]