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 A228387 #7 Sep 01 2013 18:29:58 %S A228387 5,29,268,2104,17578,143072,1177709,9646285,79185086,649376899, %T A228387 5327739196,43702127758,358509826061,2940912358777,24125201563249, %U A228387 197904782854703,1623466068552246,13317706169767704,109248620592925041 %N A228387 Number of nX5 binary arrays with top left value 1 and no two ones adjacent horizontally or vertically. %C A228387 Column 5 of A228390 %H A228387 R. H. Hardin, <a href="/A228387/b228387.txt">Table of n, a(n) for n = 1..210</a> %F A228387 Empirical: a(n) = 4*a(n-1) +36*a(n-2) -105*a(n-4) +15*a(n-5) +64*a(n-6) -20*a(n-7) -4*a(n-8) +a(n-9) %e A228387 Some solutions for n=4 %e A228387 ..1..0..0..0..0....1..0..0..1..0....1..0..0..0..0....1..0..0..0..1 %e A228387 ..0..0..1..0..1....0..0..1..0..1....0..1..0..1..0....0..1..0..1..0 %e A228387 ..1..0..0..0..0....1..0..0..0..0....0..0..1..0..0....1..0..0..0..0 %e A228387 ..0..0..0..0..1....0..0..0..0..1....0..0..0..0..0....0..0..0..0..1 %K A228387 nonn %O A228387 1,1 %A A228387 _R. H. Hardin_ Aug 21 2013