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 A303452 #4 Apr 24 2018 10:19:13 %S A303452 8,128,1690,22756,306767,4136339,55781418,752277525,10145443043, %T A303452 136824986363,1845271319103,24886004513970,335621796861796, %U A303452 4526318937807297,61043601702103344,823256462690364134 %N A303452 Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303452 Column 4 of A303456. %H A303452 R. H. Hardin, <a href="/A303452/b303452.txt">Table of n, a(n) for n = 1..210</a> %F A303452 Empirical: a(n) = 14*a(n-1) -60*a(n-3) -434*a(n-4) -284*a(n-5) +588*a(n-6) +2516*a(n-7) +2538*a(n-8) +909*a(n-9) -2033*a(n-10) -2841*a(n-11) -1886*a(n-12) -1370*a(n-13) -740*a(n-14) -208*a(n-15) %e A303452 Some solutions for n=5 %e A303452 ..0..0..0..0. .0..0..0..1. .0..0..1..0. .0..0..1..0. .0..0..0..0 %e A303452 ..0..1..1..0. .0..1..1..0. .1..0..0..1. .1..0..1..0. .0..1..1..0 %e A303452 ..1..1..0..0. .1..1..1..0. .1..1..0..0. .0..1..1..1. .1..1..0..1 %e A303452 ..1..1..0..0. .1..0..0..1. .0..1..1..0. .0..1..0..0. .0..0..0..0 %e A303452 ..0..0..1..0. .0..1..0..0. .1..0..0..1. .0..0..1..0. .1..1..0..1 %Y A303452 Cf. A303456. %K A303452 nonn %O A303452 1,1 %A A303452 _R. H. Hardin_, Apr 24 2018