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 A231842 #6 Jul 23 2025 06:43:42 %S A231842 256,3823,111621,3477361,124132900,4378313800,150624159314, %T A231842 5122053368703,173935962002791,5914591691652487,201302640481651930, %U A231842 6852837476350210815,233279127016289974579,7940697986290030781206,270291946695181993650338 %N A231842 Number of 4Xn 0..3 arrays with no element less than a strict majority of its horizontal and antidiagonal neighbors. %C A231842 Row 4 of A231839 %H A231842 R. H. Hardin, <a href="/A231842/b231842.txt">Table of n, a(n) for n = 1..210</a> %e A231842 Some solutions for n=3 %e A231842 ..0..0..0....2..1..0....2..2..0....2..2..2....0..0..0....2..1..1....1..1..0 %e A231842 ..1..1..3....0..0..0....0..0..1....0..0..3....0..0..1....1..2..2....3..0..0 %e A231842 ..1..1..0....3..3..1....2..3..2....0..1..1....0..2..0....3..3..1....3..3..2 %e A231842 ..0..0..0....1..1..1....2..2..3....2..2..2....0..0..2....2..1..1....1..1..1 %K A231842 nonn %O A231842 1,1 %A A231842 _R. H. Hardin_, Nov 14 2013