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 A300645 #4 Mar 10 2018 10:39:56 %S A300645 0,41,340,9738,268615,7455411,209156119,5850560104,164070075524, %T A300645 4598093771759,128918622840447,3614049889811873,101322289968443168, %U A300645 2840562813679842551,79635815085572716192,2232600346263905624578 %N A300645 Number of nX7 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. %C A300645 Column 7 of A300646. %H A300645 R. H. Hardin, <a href="/A300645/b300645.txt">Table of n, a(n) for n = 1..210</a> %e A300645 Some solutions for n=5 %e A300645 ..0..0..0..1..0..0..0. .0..0..0..0..0..1..1. .0..0..1..1..1..1..1 %e A300645 ..0..0..1..1..0..0..1. .0..1..1..0..1..1..0. .0..0..1..0..0..0..1 %e A300645 ..0..0..1..1..1..1..1. .0..1..1..0..1..0..0. .0..0..1..0..0..1..1 %e A300645 ..0..0..1..1..0..0..1. .0..1..0..0..1..0..0. .0..0..1..0..0..1..0 %e A300645 ..0..0..1..0..0..1..1. .0..0..0..1..1..0..0. .0..1..1..1..1..0..0 %Y A300645 Cf. A300646. %K A300645 nonn %O A300645 1,2 %A A300645 _R. H. Hardin_, Mar 10 2018