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A205195
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Number of (n+1)X3 0..3 arrays with rows and columns of permanents of all 2X2 subblocks lexicographically nondecreasing, and all 2X2 permanents nonzero
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1
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1720, 47900, 1256641, 25243114, 469617426, 7313092616, 106645806148, 1386271311184, 17063356609500, 194264369735315, 2113694462920360, 21750782413280669, 215532030982525812, 2048376973087641777
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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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EXAMPLE
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Some solutions for n=4
..3..2..1....1..2..1....3..3..0....1..0..1....0..2..2....1..0..3....0..3..0
..1..1..2....1..3..2....1..0..1....0..1..1....1..0..3....3..3..2....2..0..3
..3..2..3....1..3..0....2..3..1....1..1..1....1..2..1....1..3..2....1..3..2
..3..0..1....1..3..2....0..2..1....3..3..0....0..2..2....3..3..3....1..3..1
..2..2..3....1..3..2....2..1..2....3..1..1....1..2..1....2..2..3....1..3..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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