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Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor
0

%I #5 Mar 31 2012 12:37:15

%S 50,48,157,190,622,754,2482,3010,9922,12034,39682,48130,158722,192514,

%T 634882,770050,2539522,3080194,10158082,12320770,40632322,49283074,

%U 162529282,197132290

%N Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor

%C Diagonal of A207149

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 15 2012