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 A284226 #6 Apr 05 2020 22:48:42 %S A284226 16,212,3224,91260,2417194,68272108,1970768869,58014691963, %T A284226 1729160628627,52018078923533,1575778726620949,47999422848604301, %U A284226 1468666472458499856,45105520159013915517,1389642013052702705342,42928654746563598820849 %N A284226 Number of 5 X n 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero. %C A284226 Row 5 of A284222. %H A284226 R. H. Hardin, <a href="/A284226/b284226.txt">Table of n, a(n) for n = 1..80</a> %e A284226 Some solutions for n=4 %e A284226 ..0..0..1..1. .0..1..0..0. .0..0..1..1. .0..1..0..1. .0..0..1..1 %e A284226 ..1..0..0..0. .1..0..0..0. .1..1..0..0. .1..1..0..0. .1..1..0..0 %e A284226 ..1..1..1..0. .1..1..1..0. .0..1..0..1. .1..0..1..0. .0..0..0..0 %e A284226 ..0..1..0..0. .1..1..1..1. .0..0..1..0. .0..1..1..1. .0..0..0..0 %e A284226 ..1..0..1..1. .0..0..1..1. .1..0..1..0. .0..1..0..0. .1..1..1..0 %Y A284226 Cf. A284222. %K A284226 nonn %O A284226 1,1 %A A284226 _R. H. Hardin_, Mar 23 2017