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 A300773 #4 Mar 12 2018 11:27:02 %S A300773 0,9,32,179,1536,10374,78932,592064,4449947,33577057,252998551, %T A300773 1907641285,14383151007,108443795304,817656870230,6165008746020, %U A300773 46483483392723,350480396736512,2642584867743746,19924815133356634 %N A300773 Number of nX5 0..1 arrays with every element equal to 2, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. %C A300773 Column 5 of A300776. %H A300773 R. H. Hardin, <a href="/A300773/b300773.txt">Table of n, a(n) for n = 1..210</a> %e A300773 Some solutions for n=5 %e A300773 ..0..0..1..1..0. .0..0..0..0..0. .0..0..1..1..0. .0..0..0..1..1 %e A300773 ..0..0..1..0..0. .0..1..0..0..0. .0..0..1..0..0. .0..0..0..1..1 %e A300773 ..0..1..1..0..0. .1..1..1..1..1. .0..1..1..0..0. .1..1..0..0..1 %e A300773 ..1..1..1..0..0. .1..0..0..1..1. .0..0..1..1..0. .1..0..0..1..1 %e A300773 ..1..1..1..0..0. .0..0..0..1..1. .0..0..1..0..0. .1..1..1..1..1 %Y A300773 Cf. A300776. %K A300773 nonn %O A300773 1,2 %A A300773 _R. H. Hardin_, Mar 12 2018