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A237539
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Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the lower median minus the upper 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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256, 1888, 14208, 106496, 798208, 5985280, 44879872, 336408576, 2521595904, 18907365376, 141774028800, 1062710738944, 7965687414784, 59728115007488, 447862357884928, 3357089663549440, 25163504533110784, 188680351567052800
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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) = 3120*a(n-4) +121600*a(n-8) +4931584*a(n-12) -10485760*a(n-16) for n>17
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EXAMPLE
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Some solutions for n=4
..3..2....1..1....3..3....0..0....3..0....2..2....2..0....0..0....2..2....0..3
..3..2....1..2....0..0....3..3....1..3....1..3....2..3....1..2....2..2....2..1
..3..3....0..3....2..1....2..3....2..2....1..0....0..3....2..1....0..1....0..2
..0..0....0..2....3..2....2..3....3..0....3..0....2..0....3..1....3..2....2..2
..1..2....3..3....1..3....1..3....2..3....3..3....1..1....3..1....0..0....1..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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