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A237861
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Number of (n+1)X(1+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
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1
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81, 336, 1414, 6030, 25525, 107272, 453088, 1919632, 8117752, 34231344, 144659936, 611705384, 2586040156, 10917301088, 46143495072, 194990974880, 824264967728, 3481115148416, 14714216616096, 62164050866784, 262771277795472
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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) = 252*a(n-4) +1304*a(n-6) -1908*a(n-8) -1312*a(n-10) +1280*a(n-12) -2304*a(n-14)
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EXAMPLE
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Some solutions for n=5
..0..2....0..1....2..2....1..0....0..1....1..2....2..0....1..1....2..2....1..2
..1..1....2..2....2..1....2..0....2..2....2..2....2..2....2..0....2..1....2..1
..1..1....1..1....0..1....1..1....2..0....0..0....1..2....2..1....1..2....0..0
..0..1....0..0....2..2....1..1....1..2....1..2....1..0....0..1....2..2....0..2
..0..2....1..0....2..0....1..0....1..0....1..2....1..0....1..0....1..1....0..1
..1..1....2..0....1..2....2..0....2..0....0..0....2..1....1..1....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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