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A236775
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Number of (n+1)X(1+1) 0..2 arrays colored with the maximum plus the upper median plus the minimum minus the lower median of every 2X2 subblock
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1
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81, 474, 2797, 16360, 95961, 562284, 3296708, 19317952, 113216324, 663531280, 3889040836, 22792434328, 133579200184, 782877551360, 4588334140336, 26891207676512, 157602635364752, 923673599517440, 5413465738496512
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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) = 40*a(n-3) +528*a(n-4) +1464*a(n-5) +4428*a(n-6) +8904*a(n-7) -696*a(n-8) -16096*a(n-9) -77216*a(n-10) -159008*a(n-11) -61184*a(n-12) -18816*a(n-13) +190976*a(n-14) +365056*a(n-15) +172032*a(n-16) +73728*a(n-17)
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EXAMPLE
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Some solutions for n=5
..1..2....2..2....1..2....1..1....2..0....2..0....0..2....1..0....0..2....1..1
..0..1....2..0....0..2....0..1....0..1....1..2....0..0....1..2....0..2....2..1
..1..1....0..2....2..0....2..0....0..1....0..1....2..2....0..0....1..0....1..2
..0..2....2..2....0..0....0..0....1..1....0..0....0..2....0..0....1..1....0..0
..0..2....0..0....1..0....0..1....0..0....0..2....1..2....0..2....1..1....2..0
..0..0....0..1....2..2....2..2....2..2....1..2....2..1....2..1....1..0....1..2
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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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