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A231022
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Number of (n+3)X(6+3) 0..3 black 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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1
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4584, 419878, 8838040, 859128648, 15744800360, 1576885946694, 29418861515276, 2914693904795344, 54302516885868700, 5395553101857678590, 100529076003975579204, 9982484206536849161276, 185992129163581425898076
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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=2
..x..0..x..2..x..2..x..0..x....x..0..x..2..x..2..x..0..x
..3..x..1..x..3..x..1..x..3....1..x..3..x..3..x..1..x..3
..x..3..x..1..x..0..x..0..x....x..2..x..0..x..2..x..2..x
..0..x..2..x..0..x..2..x..3....1..x..3..x..1..x..3..x..1
..x..1..x..1..x..3..x..2..x....x..0..x..0..x..0..x..2..x
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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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