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A266035
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Number of 3Xn integer arrays with each element equal to the number of horizontal and antidiagonal neighbors less than itself.
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1
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1, 55, 481, 5594, 121029, 2045306, 33026298, 562735444, 9532097947, 160132082576, 2699812308573, 45545430005680, 767636583946670, 12939677383177473, 218153972376875945, 3677676423588950515, 61997693315879549117
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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..0..3..0....0..0..2..0....1..0..1..2....0..2..3..1....1..0..3..0
..2..0..4..1....1..3..4..0....2..1..0..2....0..0..0..1....0..1..4..0
..0..2..0..1....0..0..0..1....2..0..0..1....0..2..3..0....1..0..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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