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 A293102 #6 Apr 05 2020 23:49:48 %S A293102 0,5,48,567,3619,29952,205195,1668655,11923187,95858790,705043648, %T A293102 5616676646,42133302832,333647307242,2537702957116,20021680973470, %U A293102 153782369918531,1210816646023012,9365720486918309,73671711375313024 %N A293102 Number of 3 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 A293102 Row 3 of A293100. %H A293102 R. H. Hardin, <a href="/A293102/b293102.txt">Table of n, a(n) for n = 1..210</a> %e A293102 Some solutions for n=4 %e A293102 ..1..1..0..0. .0..1..0..0. .1..0..0..1. .0..1..0..0. .0..0..1..0 %e A293102 ..0..0..1..1. .0..1..1..1. .0..1..0..1. .1..0..1..0. .1..1..1..0 %e A293102 ..1..0..0..0. .0..0..1..0. .0..0..0..0. .0..1..0..1. .0..0..0..1 %Y A293102 Cf. A293100. %K A293102 nonn %O A293102 1,2 %A A293102 _R. H. Hardin_, Sep 30 2017