This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A134732 #6 Feb 18 2023 14:31:23
%S A134732 1,11,111,1112,11122,111223,1112234,11122345,111223457,1112234579,
%T A134732 111223457912,11122345791216,1112234579121621,111223457912162128,
%U A134732 11122345791216212837,1112234579121621283749,111223457912162128374965
%N A134732 Concatenation of first n members of the Padovan sequence A000931, starting at (1, 1, 1, 2,).
%H A134732 Harvey P. Dale, <a href="/A134732/b134732.txt">Table of n, a(n) for n = 1..125</a>
%t A134732 Module[{nn=20,padseq},padseq=LinearRecurrence[{0,1,1},{1,1,1,2},nn];Table[ FromDigits[ Flatten[IntegerDigits/@Take[padseq,n]]],{n,nn}]] (* _Harvey P. Dale_, Feb 18 2023 *)
%Y A134732 Cf. A000931, A007908, A019523, A102397. See A132347 for another version.
%K A134732 base,easy,nonn
%O A134732 1,2
%A A134732 _Omar E. Pol_, Nov 10 2007