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 A237120 #20 Feb 16 2025 08:33:21 %S A237120 0,0,2,2,2,2,4,4,2,2,8,8,4,4,10,10,2,2,8,8,8,8,14,14,4,4,14,14,10,10, %T A237120 20,20,2,2,8,8,8,8,14,14,8,8,26,26,14,14,32,32,4,4,14,14,14,14,24,24, %U A237120 10,10,32,32,20,20,42,42,2,2,8,8,8,8,14,14,8,8,26,26,14,14,32,32,8,8,26,26,26,26,44,44,14,14,44,44,32,32,62,62,4,4,14,14,14,14,24,24,14,14,44 %N A237120 Number of white areas in the graph of elementary cellular automaton with rule 150 at generation n. %C A237120 a(n) is also the number of white regions on the line at generation n of rule 150. %H A237120 Philippe Beaudoin, <a href="/A237120/b237120.txt">Table of n, a(n) for n = 0..999</a> %H A237120 Philippe Beaudoin, <a href="/A237118/a237118_1.py.txt">Python program for rule 30</a> (can be trivially modified for this sequence). %H A237120 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Rule150.html">Rule 150.</a> %Y A237120 Cf. A071036 (rule 150), A237118 (rule 30), A237119 (rule 110). %K A237120 nonn %O A237120 0,3 %A A237120 _Philippe Beaudoin_, Feb 03 2014