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A138957 as a simple table

n a(n)
1 1
2 12
3 123
4 1234
5 12345
6 123456
7 1234567
8 12345678
9 123456789
10 12345678901
11 1234567890111
12 123456789011121
13 12345678901112131
14 1234567890111213141
15 123456789011121314151
16 12345678901112131415161

[1,12,123,1234,12345,123456,1234567,12345678,
 123456789,12345678901,1234567890111,
 123456789011121,12345678901112131,
 1234567890111213141,123456789011121314151,
 12345678901112131415161]

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)