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 A318541 #4 Aug 28 2018 11:04:18 %S A318541 5,5,13,31,78,207,516,1288,3270,8271,20866,52679,133064,336062,848616, %T A318541 2143101,5412264,13667874,34516655,87168177,220132818,555919912, %U A318541 1403912579,3545419471,8953548234,22611157039,57101877461,144204222586 %N A318541 Number of nX4 0..1 arrays with every element unequal to 0, 1, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. %C A318541 Column 4 of A318545. %H A318541 R. H. Hardin, <a href="/A318541/b318541.txt">Table of n, a(n) for n = 1..210</a> %F A318541 Empirical: a(n) = a(n-1) +7*a(n-3) +3*a(n-4) +10*a(n-5) -a(n-6) +4*a(n-7) -6*a(n-8) -a(n-9) -a(n-10) -a(n-12) +a(n-13) for n>14 %e A318541 Some solutions for n=5 %e A318541 ..0..1..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0. .0..1..0..0 %e A318541 ..0..0..0..1. .1..0..0..1. .0..0..0..0. .0..0..0..0. .0..0..0..0 %e A318541 ..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..1. .0..0..0..0 %e A318541 ..0..0..0..0. .0..0..0..0. .0..1..0..0. .1..0..0..0. .0..0..0..0 %e A318541 ..0..0..0..0. .0..0..1..0. .0..0..0..0. .0..0..0..0. .0..1..0..0 %Y A318541 Cf. A318545. %K A318541 nonn %O A318541 1,1 %A A318541 _R. H. Hardin_, Aug 28 2018