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%I #5 Mar 31 2012 12:36:05
%S 625,839,17015,64680,575344,1759744,15145144,52024944,422063944,
%T 1535037344,11681382744,44716060144,324000643944,1297964842944,
%U 9013961908344,37548525033744,251396274363144,1083126105726944
%N Number of (n+1)X(n+1) 0..4 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors
%C Diagonal of A186484
%e Some solutions for 3X3
%e ..1..2..1....3..0..2....4..0..0....3..3..0....4..1..0....1..4..0....1..1..0
%e ..2..1..2....0..3..0....4..0..0....4..0..3....0..0..1....2..0..4....3..0..1
%e ..1..2..1....0..0..3....0..4..4....0..4..4....0..0..3....0..2..0....0..3..4
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 22 2011
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