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 A230066 #6 Jun 02 2025 08:40:59 %S A230066 0,1089,31329,6487209,793041921,114228452529,15615593045649, %T A230066 2168295406671681,299696508681902721,41479887674695304025, %U A230066 5738727994104197560329,794048592071068202106225 %N A230066 Number of nX6 0..2 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j). %C A230066 Column 6 of A230068 %H A230066 R. H. Hardin, <a href="/A230066/b230066.txt">Table of n, a(n) for n = 1..210</a> %e A230066 Some solutions for n=3 %e A230066 ..0..0..0..1..2..1....0..2..1..0..0..0....1..0..1..0..0..0....2..1..0..1..0..0 %e A230066 ..0..2..2..0..1..0....0..2..2..1..2..2....2..1..1..1..2..2....0..0..1..2..2..2 %e A230066 ..0..2..0..0..2..1....0..2..0..0..1..0....1..0..1..1..0..0....2..2..0..0..0..0 %K A230066 nonn %O A230066 1,2 %A A230066 _R. H. Hardin_, Oct 08 2013