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Number of (n+2)X(n+2) 0..7 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock
0

%I #5 Mar 31 2012 12:36:05

%S 134217728,3383,335092,17616908,59508492,69691980,93739724,178672908,

%T 557336396,3528280204

%N Number of (n+2)X(n+2) 0..7 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock

%C Diagonal of A186574

%e Some solutions for 4X4

%e ..0..0..7..2....0..0..0..0....0..0..4..3....0..0..0..0....0..1..0..0

%e ..0..0..0..2....0..0..0..0....0..0..0..6....2..0..0..0....0..0..1..0

%e ..0..0..0..0....0..0..0..0....0..0..0..0....6..2..0..0....5..0..0..1

%e ..0..0..0..0....3..2..0..0....0..0..0..0....6..6..2..0....0..5..0..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 23 2011