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 A232027 #6 Jul 23 2025 06:48:38 %S A232027 243,4059,156913,6129361,266779524,11145921002,456239739137, %T A232027 18580354392857,758991358642921,31071869296042840,1272557230446741460, %U A232027 52106305964179153426,2133187610503527984818,87328073453169047156246 %N A232027 Number of 5Xn 0..2 arrays with no element less than a strict majority of its horizontal and antidiagonal neighbors. %C A232027 Row 5 of A232023 %H A232027 R. H. Hardin, <a href="/A232027/b232027.txt">Table of n, a(n) for n = 1..210</a> %e A232027 Some solutions for n=3 %e A232027 ..1..1..0....0..0..2....1..1..0....0..0..2....0..0..1....0..0..0....1..1..0 %e A232027 ..0..0..0....0..0..0....2..0..2....0..1..1....0..1..0....0..1..1....2..0..2 %e A232027 ..2..2..2....1..2..0....0..2..0....0..0..0....1..0..0....0..0..0....0..2..1 %e A232027 ..1..0..0....2..0..2....0..0..1....0..0..1....2..0..0....1..0..1....1..0..0 %e A232027 ..0..0..1....0..2..2....0..1..1....1..1..2....0..1..1....0..0..0....0..0..0 %K A232027 nonn %O A232027 1,1 %A A232027 _R. H. Hardin_, Nov 17 2013