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A237780
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Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the upper median plus the minimum minus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
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1
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256, 1764, 12328, 86736, 610052, 4293744, 30217760, 212542304, 1495366768, 10525153280, 74070550592, 520994891136, 3665527224832, 25799896109056, 181566255460096, 1277095009756160, 8985167874906624, 63242311835283456
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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) = 2584*a(n-4) -329840*a(n-8) +11009280*a(n-12) -157232128*a(n-16) +824834048*a(n-20) +1067106304*a(n-24) -9353953280*a(n-28) +10336862208*a(n-32) for n>35
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EXAMPLE
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Some solutions for n=4
..2..1....2..2....0..2....3..0....3..3....0..0....2..3....3..1....2..0....3..2
..2..3....0..3....2..1....3..3....3..1....2..1....3..1....0..1....2..1....1..0
..2..0....2..3....2..1....1..3....2..3....2..1....3..3....1..2....1..0....2..0
..2..2....0..0....1..3....3..2....2..3....1..1....3..2....0..2....2..2....2..2
..1..0....3..1....2..2....2..1....0..0....2..2....3..2....1..1....2..2....3..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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