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A219369
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Number of nX4 arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 nX4 array
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1
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20, 193, 4544, 82312, 1205110, 15255786, 174413126, 1833703485, 17851830403, 162110334518, 1382147742410, 11129262089553, 85066986799604, 620037528588182, 4327291721344252, 29022486132474116, 187651131559524364
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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=3
..1..1..2..3....1..1..2..2....0..0..3..3....0..0..2..2....0..0..0..0
..1..0..0..2....1..1..1..0....0..1..1..3....0..0..0..3....0..0..0..1
..0..0..0..0....3..1..0..0....2..1..3..3....3..0..3..3....0..2..2..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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