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 A293104 #6 Apr 06 2020 00:07:54 %S A293104 0,126,3334,115870,3125547,95603353,2728695681,84096300083, %T A293104 2479929517015,76694626761338,2307939427468880,71529843693429266, %U A293104 2180882286412943668,67732692543466232241,2083494574053247942753,64842050919022586502567 %N A293104 Number of 5 X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 two less than the number of 0's adjacent to some 1. %C A293104 Row 5 of A293100. %H A293104 R. H. Hardin, <a href="/A293104/b293104.txt">Table of n, a(n) for n = 1..55</a> %e A293104 Some solutions for n=4 %e A293104 ..0..1..0..1. .1..1..0..0. .1..0..0..1. .1..0..0..0. .1..0..1..0 %e A293104 ..0..1..0..1. .0..0..0..1. .0..1..0..0. .1..0..0..1. .1..1..1..0 %e A293104 ..0..1..0..1. .0..0..0..1. .0..1..0..0. .1..0..0..0. .0..0..0..0 %e A293104 ..0..1..1..0. .1..0..0..0. .1..1..0..0. .0..1..0..0. .0..1..0..1 %e A293104 ..0..0..1..0. .1..1..0..0. .0..1..0..1. .0..1..1..1. .1..1..0..0 %Y A293104 Cf. A293100. %K A293104 nonn %O A293104 1,2 %A A293104 _R. H. Hardin_, Sep 30 2017