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 A293082 #6 Apr 05 2020 23:37:47 %S A293082 0,5,53,498,4013,31689,246743,1915490,14853287,115216476,894466395, %T A293082 6951525006,54087414608,421322913539,3285654843025,25650404747946, %U A293082 200449942963173,1567942963397654,12275547702488649,96186181822236986 %N A293082 Number of n X 3 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 A293082 Column 3 of A293087. %H A293082 R. H. Hardin, <a href="/A293082/b293082.txt">Table of n, a(n) for n = 1..210</a> %e A293082 Some solutions for n=4 %e A293082 ..1..0..0. .1..0..0. .0..1..0. .1..1..0. .0..0..0. .0..0..0. .0..1..0 %e A293082 ..0..0..0. .0..1..1. .0..0..0. .0..1..0. .1..0..0. .0..1..1. .1..0..1 %e A293082 ..1..1..0. .0..1..0. .0..0..1. .0..0..0. .1..0..0. .0..1..1. .0..1..0 %e A293082 ..0..0..1. .0..1..1. .1..0..0. .1..0..1. .0..1..1. .0..1..0. .0..1..0 %Y A293082 Cf. A293087. %K A293082 nonn %O A293082 1,2 %A A293082 _R. H. Hardin_, Sep 30 2017