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A207980
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Number of n X 4 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any diagonal or antidiagonal neighbor (colorings ignoring permutations of colors).
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2
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15, 1080, 587208, 953124784, 3410310590912, 22727131144960768, 253335104721267417984, 4382417290595586402531584, 111319355727036703898865465344, 3978834602846298450265688566196224, 193442461762324413798952526604793292800
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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 n=4
..0..0..0..0....0..1..0..0....0..0..0..0....0..0..1..0....0..0..0..0
..1..1..2..1....2..1..2..1....1..1..2..1....1..2..1..0....1..1..1..1
..0..3..0..0....0..0..0..0....2..0..0..0....0..0..1..0....2..0..0..0
..4..1..1..1....1..1..1..1....1..1..1..2....2..2..1..0....1..1..1..1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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