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A253978
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Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal maximum nondecreasing horizontally and vertically
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2
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512, 3372, 21304, 136868, 881432, 5659548, 36317408, 233116252, 1496407920, 9605229252, 61654061624, 395747083364, 2540236192136, 16305351878348, 104661317077520, 671803480591468, 4312194181808480, 27679252937604244
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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) = 7*a(n-1) -6*a(n-2) +18*a(n-3) -3*a(n-4) -123*a(n-5) +14*a(n-6) -74*a(n-7) +60*a(n-8) +396*a(n-9) +120*a(n-10) +24*a(n-11) +32*a(n-12) -32*a(n-13)
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EXAMPLE
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Some solutions for n=4
..1..0..0....1..0..0....1..0..1....1..0..0....1..0..1....1..0..0....1..0..0
..1..1..1....1..0..1....1..0..0....0..0..0....1..0..1....1..1..1....1..1..1
..0..0..1....0..0..0....1..0..0....1..0..1....0..1..1....1..1..0....1..1..1
..0..1..1....1..1..1....1..0..1....1..1..1....1..1..0....1..1..0....0..0..1
..0..0..1....0..0..1....1..0..0....0..1..0....0..0..1....1..0..0....0..0..0
..1..0..1....0..1..0....1..1..1....1..1..0....1..1..1....1..0..0....0..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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