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A223818
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Number of 4 X n 0..2 arrays with row sums nondecreasing and column sums unimodal.
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0
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15, 867, 43941, 1941904, 76453838, 2740448352, 91020540767, 2837847226191, 83919692408722, 2372632276864454, 64552746518391559, 1698928155067259979, 43440043738459660061, 1082941619670703392975
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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..0....0..1..0....0..0..1....1..2..0....2..1..0....0..0..1....1..1..1
..0..2..0....0..2..0....0..2..1....1..0..2....2..0..1....1..0..0....0..2..2
..0..2..1....1..2..2....2..1..0....1..1..1....1..2..0....1..1..1....1..2..2
..1..2..1....2..2..2....2..1..2....1..2..0....2..0..1....1..2..2....2..2..1
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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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