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A266057
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Number of 3Xn integer arrays with each element equal to the number of horizontal and antidiagonal neighbors less than or equal to itself.
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1
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1, 35, 20, 302, 10310, 127492, 1590691, 20375630, 280811810, 3864301448, 50179179330, 655917215158, 8775960264661, 116907223558842, 1546866861474179, 20490542758690403, 271954342187521110, 3609318415540677192
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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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FORMULA
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Empirical recurrence of order 94 (see link above)
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EXAMPLE
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Some solutions for n=4
..0..3..0..2....1..0..3..0....1..0..2..0....0..3..1..1....1..0..1..2
..0..4..1..0....2..0..4..1....1..4..2..2....0..4..4..0....1..4..0..2
..0..3..2..0....1..2..0..1....0..3..0..1....1..1..3..0....0..3..1..1
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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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