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 A303196 #6 Mar 09 2023 15:31:37 %S A303196 21,185,233,687,7425,34801,164295,1053249,5803057,30459340,175958088, %T A303196 988572609,5409436965,30475463803,171059829077,949886716408, %U A303196 5320086247758,29806428448927,166317770692219,930326534497792 %N A303196 Number of n X 7 0..1 arrays with every element equal to 0, 1, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303196 Column 7 of A303197. %H A303196 R. H. Hardin, <a href="/A303196/b303196.txt">Table of n, a(n) for n = 1..210</a> %e A303196 Some solutions for n=5 %e A303196 ..0..1..0..1..1..0..1. .0..1..1..0..1..0..1. .0..1..0..0..1..0..1 %e A303196 ..0..1..1..0..1..0..1. .1..0..1..0..1..1..1. .0..1..1..1..1..0..1 %e A303196 ..1..1..1..1..1..1..1. .1..0..1..0..1..0..0. .0..1..0..1..0..1..1 %e A303196 ..1..1..1..1..1..0..1. .1..0..0..1..1..1..1. .0..1..0..0..1..0..1 %e A303196 ..0..1..1..0..0..0..1. .1..1..1..1..1..0..1. .0..1..1..1..1..0..1 %Y A303196 Cf. A303197. %K A303196 nonn %O A303196 1,1 %A A303196 _R. H. Hardin_, Apr 19 2018