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 A266381 #13 Feb 16 2025 08:33:28
%S A266381 1,111,10001,1110111,100000001,11100000111,1000100010001,
%T A266381 111011101110111,10000000000000001,1110000000000000111,
%U A266381 100010000000000010001,11101110000000001110111,1000000010000000100000001,111000001110000011100000111,10001000100010001000100010001
%N A266381 Binary representation of the n-th iteration of the "Rule 22" elementary cellular automaton starting with a single ON (black) cell.
%D A266381 S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 55.
%H A266381 Robert Price, <a href="/A266381/b266381.txt">Table of n, a(n) for n = 0..1000</a>
%H A266381 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ElementaryCellularAutomaton.html">Elementary Cellular Automaton</a>
%H A266381 S. Wolfram, <a href="http://wolframscience.com/">A New Kind of Science</a>
%H A266381 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a>
%H A266381 <a href="https://oeis.org/wiki/Index_to_Elementary_Cellular_Automata">Index to Elementary Cellular Automata</a>
%t A266381 rule=22; rows=20; ca=CellularAutomaton[rule,{{1},0},rows-1,{All,All}]; (* Start with single black cell *) catri=Table[Take[ca[[k]],{rows-k+1,rows+k-1}],{k,1,rows}]; (* Truncated list of each row *) Table[FromDigits[catri[[k]]],{k,1,rows}] (* Binary Representation of Rows *)
%Y A266381 Cf. A071029.
%K A266381 nonn,easy
%O A266381 0,2
%A A266381 _Robert Price_, Dec 28 2015