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 A228284 #11 Aug 11 2014 22:45:53 %S A228284 34,277,9637,186414,4416695,97268701,2197847780,49208639399, %T A228284 1105411581741,24801939723742,556713719650007,12494370307905104, %U A228284 280426447918993931,6293836975716291709,141258681814255369288 %N A228284 Number of nX9 binary arrays with top left value 1 and no two ones adjacent horizontally, vertically or nw-se diagonally. %C A228284 Column 9 of A228285 %H A228284 R. H. Hardin, <a href="/A228284/b228284.txt">Table of n, a(n) for n = 1..210</a> %H A228284 R. H. Hardin, <a href="/A228284/a228284.txt">Empirical recurrence of order 89</a> %F A228284 Satisfies a recurrence of order 89 (see link above) - see Zeilberger links in A228285 for a proof that this is correct, and for a g.f. %e A228284 Some solutions for n=4 %e A228284 ..1..0..0..0..0..0..0..0..0....1..0..0..0..0..0..0..0..0 %e A228284 ..0..0..0..1..0..0..1..0..0....0..0..0..1..0..0..1..0..0 %e A228284 ..0..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0 %e A228284 ..0..0..1..0..1..0..1..0..1....0..0..1..0..1..0..0..1..0 %Y A228284 See A228277-A228285, especially the latter. %K A228284 nonn %O A228284 1,1 %A A228284 _R. H. Hardin_ Aug 19 2013 %E A228284 Edited by _N. J. A. Sloane_, Aug 22 2013