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 A265220 #8 Feb 16 2025 08:33:27 %S A265220 0,3,5,12,14,23,31,44,52,65,81,94,106,127,145,166,184,209,227,256,274, %T A265220 307,335,362,392,427,455,492,530,569,605,654,682,729,771,816,854,909, %U A265220 949,998,1038,1097,1149,1200,1250,1315,1363,1422,1482,1543,1603,1670 %N A265220 Total number of OFF (white) cells after n iterations of the "Rule 73" elementary cellular automaton starting with a single ON (black) cell. %D A265220 S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 55. %H A265220 Robert Price, <a href="/A265220/b265220.txt">Table of n, a(n) for n = 0..999</a> %H A265220 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ElementaryCellularAutomaton.html">Elementary Cellular Automaton</a> %H A265220 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a> %H A265220 <a href="https://oeis.org/wiki/Index_to_Elementary_Cellular_Automata">Index to Elementary Cellular Automata</a> %Y A265220 Cf. A245549, A262448, A265122, A265156, A265205, A265206, A265219. %K A265220 nonn,easy %O A265220 0,2 %A A265220 _Robert Price_, Dec 05 2015