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Number of n X n 0..2 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j)
0

%I #7 Dec 18 2015 18:18:44

%S 1,3,15,123,8613,337977,169006665,40860127671,131515599970167,

%T 201844710508818147,4141132208926170478473,40464088148356899296269059

%N Number of n X n 0..2 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j)

%C Diagonal of A230661

%e Some solutions for n=5

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_, Oct 27 2013