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 A300204 #4 Feb 28 2018 14:13:15 %S A300204 8,128,1933,29561,451996,6912249,105708560,1616600364,24722667407, %T A300204 378083758286,5782035093260,88424665581000,1352278455547082, %U A300204 20680395107688945,316265292891587218,4836645284923191877 %N A300204 Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero. %C A300204 Column 4 of A300208. %H A300204 R. H. Hardin, <a href="/A300204/b300204.txt">Table of n, a(n) for n = 1..210</a> %F A300204 Empirical: a(n) = 15*a(n-1) +4*a(n-2) +22*a(n-3) -200*a(n-4) -372*a(n-5) +49*a(n-6) +405*a(n-7) +898*a(n-8) +427*a(n-9) -28*a(n-10) -359*a(n-11) -196*a(n-12) -30*a(n-13) +64*a(n-14) +24*a(n-15) %e A300204 Some solutions for n=5 %e A300204 ..0..0..0..1. .0..0..0..1. .0..0..0..1. .0..0..0..1. .0..0..0..1 %e A300204 ..1..1..0..1. .1..0..1..1. .0..0..0..1. .0..1..0..1. .1..0..0..0 %e A300204 ..1..1..1..1. .1..1..0..1. .0..0..0..1. .0..1..0..1. .1..1..0..1 %e A300204 ..0..0..0..0. .0..0..0..0. .1..1..1..1. .0..1..1..0. .1..1..1..0 %e A300204 ..1..1..0..0. .1..1..0..0. .0..0..0..1. .0..0..1..1. .0..0..0..1 %Y A300204 Cf. A300208. %K A300204 nonn %O A300204 1,1 %A A300204 _R. H. Hardin_, Feb 28 2018