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A230934
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Number of black-square subarrays of (n+2)X(7+2) 0..3 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero
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1
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208, 1312, 27106, 208172, 5528862, 41991510, 1088383766, 8279222070, 215159062492, 1636647076866, 42522830419102, 323476245049122, 8404831728294292, 63937066423053164, 1661266085981748266
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=4
..x..0..x..0..x..0..x..2..x....x..0..x..0..x..0..x..0..x
..3..x..1..x..1..x..1..x..3....3..x..1..x..3..x..1..x..2
..x..2..x..2..x..2..x..0..x....x..2..x..0..x..2..x..3..x
..1..x..3..x..1..x..3..x..3....1..x..1..x..1..x..0..x..2
..x..0..x..2..x..2..x..2..x....x..2..x..0..x..3..x..1..x
..3..x..1..x..1..x..1..x..1....1..x..3..x..2..x..2..x..0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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