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 A231423 #6 Jul 23 2025 06:29:09 %S A231423 1617,221445,34099824,5203044823,811353885448,125876025896444, %T A231423 19554586025933205,3037479673157123589,471854862731482999906, %U A231423 73300037772908376296760,11386807913185698630539497 %N A231423 Number of (4+1)X(n+1) 0..2 arrays with no element equal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order. %C A231423 Row 4 of A231419 %H A231423 R. H. Hardin, <a href="/A231423/b231423.txt">Table of n, a(n) for n = 1..210</a> %e A231423 Some solutions for n=1 %e A231423 ..0..1....0..1....0..0....0..1....0..1....0..1....0..1....0..1....0..1....0..1 %e A231423 ..0..1....0..2....1..2....2..0....2..1....0..1....0..1....0..1....1..2....2..1 %e A231423 ..0..2....1..1....1..0....1..0....1..0....1..2....1..0....2..1....1..2....1..0 %e A231423 ..2..0....0..2....0..2....0..1....1..2....1..2....1..2....1..0....1..0....1..2 %e A231423 ..2..1....1..1....0..2....0..2....0..0....1..0....0..2....1..2....0..2....2..1 %K A231423 nonn %O A231423 1,1 %A A231423 _R. H. Hardin_, Nov 08 2013