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A199145
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Number of nX4 0..3 arrays with values 0..3 introduced in row major order and each element equal to one or two horizontal and vertical neighbors
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1
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2, 65, 2453, 125468, 6235011, 316561994, 15958823113, 806680624447, 40736752748774, 2057896226081573, 103945296750116087, 5250572116269762125, 265216743260845702081, 13396704712673136390007, 676696655003807234547723
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OFFSET
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1,1
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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..1....0..0..1..1....0..1..1..1....0..1..0..0....0..0..1..1
..2..2..2..3....1..2..3..1....0..2..3..0....0..1..0..2....0..0..2..2
..0..0..3..3....1..2..3..3....0..2..3..0....1..1..2..2....2..2..0..0
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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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