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A262574 as a simple table

n a(n)
1 1
2 12
3 123
4 1235
5 12356
6 123567
7 1235678
8 12356789
9 1235678910
10 123567891011
11 12356789101112
12 1235678910111213
13 123567891011121314
14 12356789101112131415
15 1235678910111213141516
16 123567891011121314151617
17 12356789101112131415161718
18 1235678910111213141516171819
19 123567891011121314151617181920

[1,12,123,1235,12356,123567,1235678,12356789,
 1235678910,123567891011,12356789101112,
 1235678910111213,123567891011121314,
 12356789101112131415,1235678910111213141516,
 123567891011121314151617,
 12356789101112131415161718,
 1235678910111213141516171819,
 123567891011121314151617181920]

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Last modified May 15 06:18 EDT 2021. Contains 343909 sequences. (Running on oeis4.)