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A223956
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Number of nX3 0..3 arrays with antidiagonals unimodal and rows and diagonals nondecreasing
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1
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20, 295, 3471, 41006, 485714, 5777663, 68892600, 822141033, 9813968785, 117159879996, 1398692077165, 16698106010927, 199348287106117, 2379894628461976, 28412070357384947, 339193873130519142
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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) = 20*a(n-1) -105*a(n-2) +51*a(n-3) +589*a(n-4) +1340*a(n-5) -8833*a(n-6) -2855*a(n-7) +30423*a(n-8) +57774*a(n-9) -140760*a(n-10) -176184*a(n-11) +106272*a(n-12) +544320*a(n-13)
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EXAMPLE
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Some solutions for n=3
..1..3..3....0..1..1....0..1..3....2..2..3....1..1..1....0..3..3....0..0..0
..0..2..3....1..1..2....0..2..2....1..3..3....1..2..2....1..3..3....0..0..0
..0..2..2....0..1..2....0..3..3....3..3..3....2..2..3....0..2..3....0..1..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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