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A193500
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Number of n X n symmetric 0..3 arrays with no element equal to the product mod 4 of any two of its horizontal and vertical neighbors
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0
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4, 30, 476, 16922, 1328430, 224738251, 82830799570, 66307508721755, 115414300257319497, 435721788093736397288, 3576788708181112341917385, 63678865525598948282213562255, 2464034493065067438484568541197974
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OFFSET
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1,1
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LINKS
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EXAMPLE
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Some solutions for 4X4
..3..0..1..1....2..0..1..3....0..3..3..3....3..0..3..2....3..3..3..2
..0..2..3..2....0..3..1..0....3..0..3..3....0..3..0..1....3..3..3..0
..1..3..2..1....1..1..0..3....3..3..3..0....3..0..3..2....3..3..2..3
..1..2..1..2....3..0..3..2....3..3..0..1....2..1..2..3....2..0..3..2
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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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