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 A228687 #7 Sep 01 2013 16:28:10 %S A228687 64,239,5215,32928,475809,3837761,46125216,419022831,4618533791, %T A228687 44467300608,470238325217,4657579001857,48279924803328, %U A228687 484835649414511,4977465842992607,50320320341072096,514193976056767137 %N A228687 Number of 6Xn binary arrays with no two ones adjacent horizontally, diagonally or antidiagonally. %C A228687 Row 6 of A228683 %H A228687 R. H. Hardin, <a href="/A228687/b228687.txt">Table of n, a(n) for n = 1..210</a> %F A228687 Empirical: a(n) = 4*a(n-1) +88*a(n-2) -138*a(n-3) -1388*a(n-4) +1332*a(n-5) +5911*a(n-6) -2920*a(n-7) -8340*a(n-8) +816*a(n-9) +2232*a(n-10) %e A228687 Some solutions for n=4 %e A228687 ..0..0..0..0....1..0..0..0....0..0..1..0....1..0..0..0....0..1..0..1 %e A228687 ..1..0..1..0....1..0..1..0....1..0..1..0....0..0..0..0....0..0..0..0 %e A228687 ..1..0..1..0....1..0..1..0....1..0..0..0....1..0..0..0....0..1..0..1 %e A228687 ..0..0..0..0....0..0..0..0....1..0..0..1....0..0..0..1....0..0..0..1 %e A228687 ..0..0..0..1....0..0..0..0....1..0..0..1....0..0..0..1....0..0..0..1 %e A228687 ..0..0..0..1....0..0..0..1....1..0..0..1....1..0..0..1....1..0..0..1 %K A228687 nonn %O A228687 1,1 %A A228687 _R. H. Hardin_ Aug 30 2013