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 A303241 #4 Apr 20 2018 10:54:51 %S A303241 1,123,236,1676,11111,90728,686376,5320294,42575026,345713805, %T A303241 2801331069,22819881078,186805008216,1528961515269,12526736579284, %U A303241 102761508859349,843215927212293,6920803923723062,56822359222413226,466601882566586351 %N A303241 Number of nX7 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303241 Column 7 of A303242. %H A303241 R. H. Hardin, <a href="/A303241/b303241.txt">Table of n, a(n) for n = 1..210</a> %e A303241 Some solutions for n=5 %e A303241 ..0..1..0..0..1..0..0. .0..0..0..1..1..0..1. .0..1..1..0..1..0..0 %e A303241 ..0..1..0..0..1..0..0. .1..0..0..1..1..0..1. .0..1..1..0..1..0..0 %e A303241 ..0..1..0..0..1..0..1. .0..0..0..1..1..0..1. .1..1..0..0..0..0..1 %e A303241 ..1..1..1..0..0..0..1. .1..1..1..0..0..0..0. .0..1..1..0..1..0..0 %e A303241 ..0..1..0..0..1..0..0. .0..1..0..0..1..0..1. .0..1..1..0..1..0..0 %Y A303241 Cf. A303242. %K A303241 nonn %O A303241 1,2 %A A303241 _R. H. Hardin_, Apr 20 2018