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A232252
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Number of (n+1)X(3+1) 0..2 arrays with every element both >= and <= some horizontal or antidiagonal neighbor
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1
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215, 6189, 175431, 4987471, 141815403, 4032714105, 114676900023, 3261035421093, 92733208328669, 2637030152019143, 74988542695581639, 2132429753296994177, 60639352262137170177, 1724385545471376948763, 49035904880139271370475
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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: a(n) = 27*a(n-1) +67*a(n-2) -667*a(n-3) -2143*a(n-4) -874*a(n-5) -67*a(n-6) +187*a(n-7) +95*a(n-8) +16*a(n-9) for n>10
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EXAMPLE
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Some solutions for n=3
..0..0..0..1....0..0..2..2....0..0..0..1....1..1..1..1....0..0..2..2
..1..1..2..2....2..2..1..1....0..2..2..2....1..1..1..2....0..2..0..0
..2..2..0..1....1..0..2..2....2..2..0..0....0..0..2..1....0..0..2..2
..2..0..1..1....0..1..2..2....1..1..0..0....0..1..0..0....1..1..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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