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 A302682 #7 Jul 11 2018 22:07:04 %S A302682 8,6,7,20,30,76,217,509,1189,3034,7569,18274,44932,111561,274057, %T A302682 672217,1657278,4083105,10038822,24702412,60827449,149699125, %U A302682 368356029,906653234,2231584641,5492001706,13516457764,33267138281,81875898241 %N A302682 Number of 4Xn 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302682 Row 4 of A302680. %H A302682 R. H. Hardin, <a href="/A302682/b302682.txt">Table of n, a(n) for n = 1..210</a> %F A302682 Empirical: a(n) = a(n-1) +a(n-2) +5*a(n-3) +5*a(n-4) -3*a(n-5) -3*a(n-6) +2*a(n-7) for n>11 %e A302682 Some solutions for n=5 %e A302682 ..0..1..1..1..0. .0..1..0..0..0. .0..1..1..1..0. .0..1..0..1..0 %e A302682 ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0 %e A302682 ..0..1..0..0..0. .0..1..0..1..0. .0..0..0..1..0. .0..1..0..1..0 %e A302682 ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0 %Y A302682 Cf. A302680. %K A302682 nonn %O A302682 1,1 %A A302682 _R. H. Hardin_, Apr 11 2018