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A159901 as a simple table

n a(n)
1 1
2 12
3 123
4 1235
5 12356
6 123567
7 12356710
8 1235671011
9 123567101113
10 12356710111314
11 1235671011131415
12 123567101113141517
13 12356710111314151719
14 1235671011131415171921
15 123567101113141517192122

[1,12,123,1235,12356,123567,12356710,1235671011,
 123567101113,12356710111314,1235671011131415,
 123567101113141517,12356710111314151719,
 1235671011131415171921,123567101113141517192122]

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Last modified May 12 02:23 EDT 2021. Contains 343808 sequences. (Running on oeis4.)