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 A265205 #12 Feb 16 2025 08:33:27
%S A265205 1,0,3,0,7,2,5,2,9,6,5,10,13,6,11,10,15,10,19,10,23,10,17,20,19,16,25,
%T A265205 18,19,20,25,14,37,20,27,26,35,20,37,30,41,24,33,36,39,26,45,36,37,38,
%U A265205 41,36,49,44,29,56,39,40,57,40,43,60,39,48,55,44,45,64
%N A265205 Number of ON (black) cells in the n-th iteration of the "Rule 73" elementary cellular automaton starting with a single ON (black) cell.
%D A265205 S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 55.
%H A265205 Robert Price, <a href="/A265205/b265205.txt">Table of n, a(n) for n = 0..999</a>
%H A265205 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ElementaryCellularAutomaton.html">Elementary Cellular Automaton</a>
%H A265205 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a>
%H A265205 <a href="https://oeis.org/wiki/Index_to_Elementary_Cellular_Automata">Index to Elementary Cellular Automata</a>
%t A265205 rule = 73; rows = 30; Table[Total[Table[Take[CellularAutomaton[rule, {{1},0},rows-1,{All,All}][[k]], {rows-k+1, rows+k-1}], {k,1,rows}][[k]]], {k,1,rows}]
%Y A265205 Cf. A245549, A262448, A265122, A265156.
%K A265205 nonn,easy
%O A265205 0,3
%A A265205 _Robert Price_, Dec 04 2015