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A198704
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Number of nX4 0..4 arrays with values 0..4 introduced in row major order and each element equal to at least one horizontal or vertical neighbor
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1
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2, 76, 3893, 322230, 30407251, 3075124662, 316137386807, 32741782389619, 3397146912481247, 352742075116393899, 36634081239038426907, 3804936727099857364455, 395201634386514861187551
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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..0..1..1....0..0..1..1....0..0..1..1....0..0..1..2....0..1..1..2
..2..0..3..4....2..2..3..3....2..2..3..3....3..1..1..2....0..3..1..2
..2..0..3..4....4..4..3..3....3..3..4..4....3..3..4..4....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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