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 A231380 #6 Jul 23 2025 06:26:44 %S A231380 21,261,6126,120124,2547810,54485279,1157805351,24615811883, %T A231380 523548909308,11133382117666,236751472446562,5034642562404119, %U A231380 107064153494511600,2276766498890520783,48416455811053263714,1029597712238409457187 %N A231380 Number of nX6 0..1 arrays with no element less than a strict majority of its horizontal and vertical neighbors. %C A231380 Column 6 of A231382 %H A231380 R. H. Hardin, <a href="/A231380/b231380.txt">Table of n, a(n) for n = 1..210</a> %e A231380 Some solutions for n=3 %e A231380 ..0..0..0..0..1..0....0..1..0..0..1..0....0..1..1..1..0..0....0..0..1..0..0..0 %e A231380 ..1..0..0..0..1..0....0..0..0..0..1..0....0..0..0..0..0..0....1..0..0..0..0..0 %e A231380 ..0..0..0..1..1..0....1..0..0..1..1..0....0..1..1..0..0..0....1..1..0..0..1..0 %K A231380 nonn %O A231380 1,1 %A A231380 _R. H. Hardin_, Nov 08 2013