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 A267609 #10 Feb 16 2025 08:33:29
%S A267609 1,7,21,127,381,1911,5461,32767,98301,491511,1408981,8355711,25001341,
%T A267609 125269879,357913941,2147483647,6442450941,32212254711,92341796821,
%U A267609 547608330111,1638530022781,8209829984119,23456963876181,140735340838911,422201727483901
%N A267609 Decimal representation of the n-th iteration of the "Rule 182" elementary cellular automaton starting with a single ON (black) cell.
%D A267609 S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 55.
%H A267609 Robert Price, <a href="/A267609/b267609.txt">Table of n, a(n) for n = 0..1000</a>
%H A267609 A. J. Macfarlane, <a href="http://www.damtp.cam.ac.uk/user/ajm/Papers2016/GFsForCAsOfEvenRuleNo.ps">Generating functions for integer sequences defined by the evolution of cellular automata...</a>, Fig. 2.
%H A267609 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ElementaryCellularAutomaton.html">Elementary Cellular Automaton</a>
%H A267609 S. Wolfram, <a href="http://wolframscience.com/">A New Kind of Science</a>
%H A267609 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a>
%H A267609 <a href="https://oeis.org/wiki/Index_to_Elementary_Cellular_Automata">Index to Elementary Cellular Automata</a>
%t A267609 rule=182; 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]],2],{k,1,rows}] (* Decimal Representation of Rows *)
%Y A267609 Cf. A071038.
%K A267609 nonn,easy
%O A267609 0,2
%A A267609 _Robert Price_, Jan 18 2016