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A230828
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Number of nX5 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero
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1
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0, 16, 38, 176, 898, 4350, 22852, 122740, 661598, 3593650, 19572998, 106801924, 583264796, 3186690816, 17414382012, 95176462582, 520213927428, 2843500943294, 15543058517272, 84962392690912, 464431030442718, 2538739709562252
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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=4
..0..1..3..1..0....0..3..0..3..0....0..3..2..0..2....0..3..2..0..1
..3..2..0..2..3....1..2..1..2..1....1..0..1..3..1....1..0..1..3..2
..0..1..3..1..0....0..3..0..3..2....2..3..2..0..3....2..3..2..1..0
..3..2..0..2..3....2..1..2..0..1....0..1..3..1..2....1..0..3..2..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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