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A232409
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Number of (n+1) X (3+1) 0..2 arrays with every element both >= and <= some horizontal, diagonal or antidiagonal neighbor.
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1
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973, 44971, 2189991, 107913855, 5322933313, 262249675165, 12924602609687, 636974571589143, 31392224093121163, 1547115367969767881, 76247135423218512743, 3757719192867286695513, 185193231246257132276941
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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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FORMULA
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Empirical recurrence of order 64 (see link above).
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EXAMPLE
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Some solutions for n=2
..1..2..1..1....1..2..1..2....2..0..2..0....1..1..2..2....1..1..2..1
..1..1..2..1....2..1..2..1....2..2..0..2....1..0..1..2....2..2..0..2
..2..2..0..0....1..1..1..1....2..1..1..0....0..1..0..1....2..2..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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