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A266064
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Number of nX4 integer arrays with each element equal to the number of horizontal, vertical, diagonal and antidiagonal neighbors exactly one smaller than itself.
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1
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5, 89, 81, 525, 8262, 25663, 148323, 1480037, 7361668, 43625889, 337487030, 1992491986, 12259297662, 84919942819, 531642104603, 3345439670726, 22164717425170, 141438239886755, 900411960327132, 5860940525461256
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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=4
..0..2..1..0....0..2..2..0....1..1..2..0....0..1..2..0....1..2..1..2
..1..2..3..2....2..1..1..2....0..1..2..0....2..3..3..1....0..2..0..1
..2..3..0..1....2..1..1..2....2..2..3..0....1..2..3..2....0..2..2..2
..1..0..2..1....0..2..2..0....0..1..2..1....0..2..1..0....1..2..1..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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