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A207296
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Number of (n+1)X3 0..3 arrays with rows and columns of determinants of all 2X2 subblocks lexicographically nondecreasing
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1
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2338, 93991, 2019514, 33860323, 521236935, 8125554503, 129766993681, 2097529018861, 34031232967856, 552743117801949, 8980781167531052, 145936287642008829, 2371573852386690882, 38540844929539700726
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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) = 24*a(n-1) -102*a(n-2) -656*a(n-3) +4911*a(n-4) -9576*a(n-5) +5400*a(n-6) for n>28
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EXAMPLE
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Some solutions for n=4
..3..3..3....3..0..0....0..2..2....1..1..3....0..0..1....2..3..2....2..1..1
..2..0..0....2..0..1....1..1..0....3..0..0....0..0..3....0..0..0....0..0..0
..3..0..3....0..0..2....1..1..2....0..0..3....3..0..0....3..2..3....3..1..3
..2..1..0....1..0..0....2..3..0....2..0..3....3..0..1....0..0..0....3..1..3
..2..3..3....1..0..2....0..1..1....3..0..1....1..0..3....2..3..0....3..1..3
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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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