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 A293084 #6 Apr 05 2020 23:39:12 %S A293084 0,124,4091,125848,3786544,114271723,3464680837,105517939849, %T A293084 3226317873349,98993221147045,3046729346513705,94021836073596160, %U A293084 2908369805243433206,90152447341950898741,2799699600908925841358 %N A293084 Number of n X 5 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 A293084 Column 5 of A293087. %H A293084 R. H. Hardin, <a href="/A293084/b293084.txt">Table of n, a(n) for n = 1..210</a> %e A293084 Some solutions for n=4 %e A293084 ..0..0..0..1..0. .0..1..1..1..0. .1..1..0..0..1. .0..0..0..1..1 %e A293084 ..0..0..0..1..0. .0..0..0..1..0. .0..1..1..1..0. .1..0..0..1..1 %e A293084 ..1..1..0..0..1. .0..1..1..1..0. .0..0..0..0..0. .0..1..1..0..0 %e A293084 ..1..0..1..0..0. .0..1..1..0..0. .0..1..1..0..1. .0..0..0..0..1 %Y A293084 Cf. A293087. %K A293084 nonn %O A293084 1,2 %A A293084 _R. H. Hardin_, Sep 30 2017