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A233140
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Number of n X n 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order
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0
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..0..1....0..1..2....0..1..2....0..0..1....0..1..2....0..1..5....0..1..5
..4..0..1....3..0..4....2..0..1....4..2..0....1..5..4....1..5..2....2..2..4
..2..1..1....0..4..0....1..0..0....0..4..4....5..5..3....5..1..5....5..4..5
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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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