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%I #5 Mar 31 2012 12:36:05
%S 1251,2049,4810,16762,25633,67714,101305,286290,456113,1219034,
%T 2037173,5189546,9017049,22136029,39734818,94665157,174517432,
%U 405721297,764487337,1742099164,3341954341,7491958474,14584990777,32261305429
%N Number of (n+1)X5 0..3 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors
%C Column 4 of A186482
%H R. H. Hardin, <a href="/A186477/b186477.txt">Table of n, a(n) for n = 1..200</a>
%F 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>15
%e Some solutions for 3X5
%e ..0..0..0..3..0....0..0..0..1..0....2..0..0..0..0....2..1..0..0..0
%e ..2..0..0..0..3....3..0..0..0..1....2..0..0..0..0....3..0..1..0..0
%e ..0..2..0..0..2....2..3..0..0..0....2..0..0..0..1....0..3..0..1..3
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 22 2011
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