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 A265224 #20 Feb 16 2025 08:33:27 %S A265224 0,0,2,3,8,10,18,21,31,38,48,57,70,78,94,103,121,137,154,169,189,209, %T A265224 231,250,273,297,324,346,373,398,428,452,491,519,559,584,625,656,695, %U A265224 729,763,805,845,883,934,970,1021,1065,1118,1164,1222,1266,1319,1366 %N A265224 Total number of OFF (white) cells after n iterations of the "Rule 30" elementary cellular automaton starting with a single ON (black) cell. %C A265224 Rule 86, the mirror image of Rule 30, also generates this sequence. - _Karl V. Keller, Jr._, Sep 20 2020 %D A265224 S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 55. %H A265224 Robert Price, <a href="/A265224/b265224.txt">Table of n, a(n) for n = 0..999</a> %H A265224 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ElementaryCellularAutomaton.html">Elementary Cellular Automaton</a> %H A265224 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Rule30.html">Rule 30</a> %H A265224 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a> %H A265224 <a href="https://oeis.org/wiki/Index_to_Elementary_Cellular_Automata">Index to Elementary Cellular Automata</a> %Y A265224 Cf. A051023, A070950, A070951, A070952, A092539, A110240, A110267, A245549. %K A265224 nonn,easy %O A265224 0,3 %A A265224 _Robert Price_, Dec 05 2015