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 A230189 #6 Jun 02 2025 08:42:57 %S A230189 0,2049,143451,34825803,7303192425,1576417829097,337613109419463, %T A230189 72442679020274343,15538191696598121541,3333031870313982444195, %U A230189 714944148431332304491227,153357839247813109681299999 %N A230189 Number of 6Xn 0..2 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value 2-x(i,j). %C A230189 Row 6 of A230184 %H A230189 R. H. Hardin, <a href="/A230189/b230189.txt">Table of n, a(n) for n = 1..210</a> %e A230189 Some solutions for n=3 %e A230189 ..1..1..0....1..1..2....1..1..1....1..1..2....1..1..0....1..1..1....0..2..1 %e A230189 ..1..2..1....2..0..2....1..2..0....1..0..0....0..2..2....1..1..2....1..1..0 %e A230189 ..1..1..0....2..0..2....0..0..0....0..2..1....2..0..1....1..0..2....1..2..1 %e A230189 ..0..2..0....2..0..2....2..2..2....1..1..0....1..1..0....2..1..1....0..1..1 %e A230189 ..2..0..2....2..1..1....2..0..2....1..2..1....1..2..2....1..0..1....1..1..2 %e A230189 ..2..2..0....2..0..2....2..0..2....1..1..1....0..0..2....2..1..1....2..0..2 %K A230189 nonn %O A230189 1,2 %A A230189 _R. H. Hardin_, Oct 11 2013