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%I A186480 #5 Mar 31 2012 12:36:05
%S A186480 20079,14492,82632,101305,433513,418177,1849873,1894849,7687009,
%T A186480 8602033,31645329,39574001,131802797,181420169,553069145,820669641,
%U A186480 2331052105,3678141757,9868524241,16371829777,41936161201,72480530737,178779125389
%N A186480 Number of (n+1)X8 0..3 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors
%C A186480 Column 7 of A186482
%H A186480 R. H. Hardin, <a href="/A186480/b186480.txt">Table of n, a(n) for n = 1..200</a>
%F A186480 Empirical: a(n)=2*a(n-1)+2*a(n-2)-6*a(n-3)+6*a(n-4)-3*a(n-5) for n>18
%e A186480 Some solutions for 3X8
%e A186480 ..0..0..0..0..1..0..0..0....2..0..1..0..1..0..2..0....1..0..2..0..0..0..3..3
%e A186480 ..3..0..0..0..0..1..0..0....0..2..0..1..0..1..0..2....0..1..0..2..0..0..0..3
%e A186480 ..2..3..0..0..0..0..1..0....3..0..2..0..1..0..1..0....3..0..1..0..2..0..0..0
%K A186480 nonn
%O A186480 1,1
%A A186480 _R. H. Hardin_ Feb 22 2011

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