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 A302740 #4 Apr 12 2018 11:21:04 %S A302740 64,8192,615589,50012515,4104115772,336126343424,27552364197684, %T A302740 2258515399666414,185133937573802146,15175842668215691966, %U A302740 1243997339324531820830,101973231441890685645169 %N A302740 Number of nX7 0..1 arrays with every element equal to 0, 1, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302740 Column 7 of A302741. %H A302740 R. H. Hardin, <a href="/A302740/b302740.txt">Table of n, a(n) for n = 1..210</a> %e A302740 Some solutions for n=5 %e A302740 ..0..0..1..0..1..0..1. .0..0..1..0..0..1..1. .0..0..1..1..0..0..1 %e A302740 ..0..0..1..1..0..1..1. .0..0..1..1..1..0..0. .0..0..1..1..0..0..1 %e A302740 ..0..0..0..0..1..0..0. .0..0..0..0..0..0..0. .0..0..0..0..0..0..1 %e A302740 ..0..0..1..1..0..1..1. .0..0..1..1..1..0..1. .0..0..1..1..1..1..0 %e A302740 ..0..1..1..1..0..0..1. .0..0..1..0..0..0..1. .0..0..1..0..0..0..1 %Y A302740 Cf. A302741. %K A302740 nonn %O A302740 1,1 %A A302740 _R. H. Hardin_, Apr 12 2018