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 A230673 #6 Jun 02 2025 08:45:04 %S A230673 33,21933,6081561,1844154933,559929294657,169908632412447, %T A230673 51564141085334199,15648664251672721725,4749050405190938157075, %U A230673 1441240135293669121537797,437387035655507564724178683 %N A230673 Number of nX6 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j). %C A230673 Column 6 of A230675 %H A230673 R. H. Hardin, <a href="/A230673/b230673.txt">Table of n, a(n) for n = 1..191</a> %e A230673 Some solutions for n=3 %e A230673 ..0..0..0..1..2..0....0..0..0..0..0..2....0..0..0..0..1..1....0..0..0..0..2..1 %e A230673 ..0..2..2..1..1..0....1..2..2..2..1..2....1..2..2..2..2..1....0..2..2..2..1..2 %e A230673 ..0..0..0..1..2..0....1..1..0..0..1..1....1..1..0..1..1..0....2..0..2..1..0..2 %K A230673 nonn %O A230673 1,1 %A A230673 _R. H. Hardin_, Oct 27 2013