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%I #5 Mar 31 2012 12:36:05
%S 3306753,104547,407733,2526165,5080629,5654805,5711805,5769381,
%T 5831421,5959701,6475413,9316941,19268469,36584472,55233771,81033246,
%U 128348841,198142701,273483585,378799581,578518521,897620265,1289310978,1848325452
%N Number of (n+3)X7 0..3 arrays with every 4X4 subblock commuting with each horizontal and vertical neighbor 4X4 subblock
%C Column 4 of A186599
%H R. H. Hardin, <a href="/A186594/b186594.txt">Table of n, a(n) for n = 1..65</a>
%F Empirical: a(n)=2*a(n-1)-a(n-2)+3*a(n-4)-6*a(n-5)+3*a(n-6)+3*a(n-8)-3*a(n-9) for n>14
%e Some solutions for 5X7
%e ..0..0..0..0..0..3..1....2..0..0..0..0..2..3....0..0..0..0..0..1..3
%e ..0..0..0..0..0..1..3....0..0..0..0..0..0..0....0..0..0..0..0..0..3
%e ..2..0..0..0..0..0..0....0..0..0..0..0..0..3....3..0..0..0..0..0..1
%e ..3..0..0..0..0..0..0....0..0..0..0..0..0..0....2..0..0..0..0..0..0
%e ..2..0..0..0..0..0..0....0..2..0..0..0..0..0....1..3..0..0..0..0..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 24 2011
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