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 A293086 #6 Apr 05 2020 23:40:29 %S A293086 3,2103,246852,28709764,3370860734,400400301913,48001754870966, %T A293086 5797084510052322,704256987414278983,85972707914136829157, %U A293086 10537720695667977589004,1296036949777139758454158 %N A293086 Number of n X 7 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 A293086 Column 7 of A293087. %H A293086 R. H. Hardin, <a href="/A293086/b293086.txt">Table of n, a(n) for n = 1..100</a> %e A293086 Some solutions for n=2 %e A293086 ..0..0..0..1..0..0..1. .1..0..1..0..0..1..0. .0..1..0..0..1..0..1 %e A293086 ..0..1..0..0..0..1..1. .0..1..0..0..1..0..1. .0..1..0..1..0..0..1 %Y A293086 Cf. A293087. %K A293086 nonn %O A293086 1,1 %A A293086 _R. H. Hardin_, Sep 30 2017