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 A293091 #6 Apr 05 2020 23:43:24 %S A293091 0,60,4013,126903,3786544,112687158,3370860734,101584123289, %T A293091 3080052428762,93872530904247,2873222643510833,88260410746680709, %U A293091 2719519768455485871,84016899402147182297,2601591974148719198874 %N A293091 Number of 5 X n 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 two less than the number of 0's adjacent to some 1. %C A293091 Row 5 of A293087. %H A293091 R. H. Hardin, <a href="/A293091/b293091.txt">Table of n, a(n) for n = 1..80</a> %e A293091 Some solutions for n=4 %e A293091 ..1..1..0..0. .0..0..0..0. .1..0..0..1. .0..0..1..0. .0..1..0..0 %e A293091 ..0..1..0..1. .0..1..0..0. .1..1..0..0. .1..0..0..1. .1..0..1..1 %e A293091 ..1..0..1..0. .0..1..1..1. .0..0..1..1. .1..0..0..1. .1..0..1..0 %e A293091 ..0..0..0..0. .1..0..1..0. .1..0..1..0. .0..0..1..0. .1..0..0..1 %e A293091 ..0..0..1..1. .1..0..0..0. .0..0..0..1. .0..1..0..1. .0..0..0..0 %Y A293091 Cf. A293087. %K A293091 nonn %O A293091 1,2 %A A293091 _R. H. Hardin_, Sep 30 2017