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 A231649 #6 Jul 23 2025 06:36:13 %S A231649 121,4040,490760,42882766,3936913977,374409597564,35384751611050, %T A231649 3335789961947404,314852421269523851,29721381118553717447, %U A231649 2805039910196136173308,264733396758705184183618 %N A231649 Number of nX6 0..2 arrays with no element less than a strict majority of its horizontal and vertical neighbors. %C A231649 Column 6 of A231651 %H A231649 R. H. Hardin, <a href="/A231649/b231649.txt">Table of n, a(n) for n = 1..210</a> %e A231649 Some solutions for n=3 %e A231649 ..2..0..0..0..2..2....0..0..0..0..0..0....0..1..2..2..2..1....2..0..0..0..0..0 %e A231649 ..0..0..0..0..0..1....0..2..2..0..0..0....0..1..0..0..0..1....0..0..0..0..0..2 %e A231649 ..0..2..0..0..0..1....0..2..2..0..0..2....0..1..0..0..0..2....0..2..2..2..2..2 %K A231649 nonn %O A231649 1,1 %A A231649 _R. H. Hardin_, Nov 12 2013