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A193784
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Number of n X n symmetric 0..5 arrays with no element equal to the sum or difference mod 6 of any two of its horizontal and vertical neighbors
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0
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6, 75, 1383, 82057, 17485499, 12269256241, 26618983431241, 174570423155403607, 3439388112891290777185, 203331913765001724843185283, 36063230821901471856813524283909, 19188799396869069058685453832499056759
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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
..1..5..1..1....1..3..3..4....1..1..5..1....1..3..3..5....1..1..3..3
..5..3..3..3....3..3..3..3....1..3..1..5....3..3..5..5....1..1..1..5
..1..3..1..1....3..3..2..2....5..1..3..1....3..5..3..1....3..1..1..1
..1..3..1..5....4..3..2..2....1..5..1..5....5..5..1..3....3..5..1..3
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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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