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A198665
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Number of nX4 0..4 arrays with values 0..4 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, 2715, 199923, 16089057, 1382332582, 119026441960, 10314841920242, 893422225702521, 77438142132961570, 6711121950891144754, 581664320030297340439, 50412657929233287557664, 4369297837622133342788917
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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 with all values 0 to 4 for n=3
..0..1..2..2....0..0..1..1....0..0..1..1....0..0..1..1....0..1..1..2
..0..1..3..4....2..3..3..3....2..3..3..3....2..2..3..3....0..0..1..2
..3..3..3..4....2..4..4..3....2..4..4..4....4..4..1..1....3..3..4..4
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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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