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Number of (n+3)X(n+3) 0..3 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero
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%I #4 Nov 01 2013 20:14:33

%S 6,34,8374,606224,584293702,295706164414,2042677948725090

%N Number of (n+3)X(n+3) 0..3 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero

%C Diagonal of A230949

%e Some solutions for n=2

%e ..0..x..0..x..0....0..x..0..x..2....0..x..2..x..2....0..x..0..x..0

%e ..x..1..x..1..x....x..1..x..3..x....x..1..x..3..x....x..1..x..1..x

%e ..0..x..2..x..0....0..x..2..x..2....0..x..0..x..2....0..x..2..x..2

%e ..x..3..x..1..x....x..1..x..1..x....x..1..x..3..x....x..1..x..3..x

%e ..2..x..0..x..0....0..x..0..x..0....0..x..2..x..2....0..x..0..x..2

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 01 2013