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 A228679 #9 Sep 02 2013 13:01:06 %S A228679 8,40,216,1152,6160,32928,176032,941056,5030848,26894720,143778176, %T A228679 768632832,4109082880,21967006208,117434808832,627802177536, %U A228679 3356207397888,17942161561600,95918137153536,512774840614912 %N A228679 Number of nX4 binary arrays with no two ones adjacent horizontally, diagonally or antidiagonally. %C A228679 Column 4 of A228683 %H A228679 R. H. Hardin, <a href="/A228679/b228679.txt">Table of n, a(n) for n = 1..210</a> %F A228679 Empirical: a(n) = 6*a(n-1) -2*a(n-2) -8*a(n-3). %F A228679 Empirical: G.f. -8*x*(-1+x+x^2) / ( 1-6*x+2*x^2+8*x^3 ). - _R. J. Mathar_, Aug 31 2013 %e A228679 Some solutions for n=4 %e A228679 ..0..0..1..0....0..1..0..1....1..0..0..0....0..0..0..1....1..0..0..1 %e A228679 ..0..0..0..0....0..0..0..1....0..0..0..1....1..0..0..0....1..0..0..0 %e A228679 ..1..0..1..0....1..0..0..0....0..0..0..1....1..0..0..1....0..0..0..0 %e A228679 ..1..0..1..0....0..0..0..0....1..0..0..1....1..0..0..0....1..0..0..0 %K A228679 nonn %O A228679 1,1 %A A228679 _R. H. Hardin_ Aug 30 2013