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 A260839 #6 Jun 02 2025 12:11:58 %S A260839 1320,1645,3470,6232,8646,19718,37882,58489,116930,248515,412314, %T A260839 751247,1604892,2935059,5115588,10451412,20331520,35935935,69439734, %U A260839 138338285,252687084,471920997,934503484,1761244126,3253322750,6325629935 %N A260839 Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101. %C A260839 Column 6 of A260841 %H A260839 R. H. Hardin, <a href="/A260839/b260839.txt">Table of n, a(n) for n = 1..210</a> %H A260839 R. H. Hardin, <a href="/A260839/a260839.txt">Empirical recurrence of order 92</a> %F A260839 Empirical recurrence of order 92 (see link above) %e A260839 Some solutions for n=4 %e A260839 ..0..0..0..0..0..0..0..1....0..0..0..0..0..0..0..1....0..0..0..1..1..0..0..0 %e A260839 ..0..0..0..0..0..0..1..1....0..0..1..1..0..0..1..0....1..0..0..0..0..0..0..1 %e A260839 ..0..0..1..1..0..0..0..0....0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..1 %e A260839 ..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0....0..0..0..1..1..0..0..0 %e A260839 ..0..0..0..0..0..0..1..1....0..0..1..0..0..1..0..0....1..0..0..0..0..0..0..0 %e A260839 ..0..0..1..1..0..0..0..0....0..0..1..0..0..1..0..0....0..0..0..0..0..0..0..1 %Y A260839 Cf. A260841 %K A260839 nonn %O A260839 1,1 %A A260839 _R. H. Hardin_, Aug 01 2015