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 A302002 #4 Mar 30 2018 12:32:17 %S A302002 0,34,48,200,2856,14016,122232,813704,6066698,43025282,311301306, %T A302002 2237774274,16116010598,116014746014,835190383512,6012793756932, %U A302002 43286754359604,311629669798802,2243474218816140,16151152920460132 %N A302002 Number of 5Xn 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. %C A302002 Row 5 of A301999. %H A302002 R. H. Hardin, <a href="/A302002/b302002.txt">Table of n, a(n) for n = 1..210</a> %e A302002 Some solutions for n=5 %e A302002 ..0..0..0..0..0. .0..0..1..0..0. .0..0..0..1..1. .0..0..1..1..0 %e A302002 ..1..1..1..0..0. .1..1..1..1..0. .1..1..0..1..0. .0..1..1..0..1 %e A302002 ..0..0..1..1..1. .1..0..1..0..0. .0..0..1..0..0. .0..0..1..1..1 %e A302002 ..1..1..0..0..0. .0..1..1..0..0. .1..1..1..0..1. .0..0..1..0..1 %e A302002 ..0..0..1..1..1. .0..0..1..1..1. .1..1..0..1..1. .1..1..0..1..1 %Y A302002 Cf. A301999. %K A302002 nonn %O A302002 1,2 %A A302002 _R. H. Hardin_, Mar 30 2018