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A264636
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Number of nX2 arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 4.
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0
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1, 3, 16, 128, 1152, 12960, 269568, 6635520, 165888000, 4561920000, 209018880000, 10480803840000, 513559388160000, 26454892584960000, 2106067546275840000
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=4
..4..0....0..1....0..4....0..2....4..1....4..0....4..0....0..5....0..1....4..0
..2..1....4..5....1..5....4..6....0..6....2..5....5..1....4..1....4..5....1..5
..6..5....2..7....2..6....5..3....5..7....6..1....2..6....6..2....6..2....2..3
..3..7....6..3....3..7....1..7....2..3....7..3....3..7....3..7....3..7....6..7
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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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