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A224281
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T(n,k)=Number of nXk 0..3 arrays with diagonals and rows unimodal and antidiagonals nondecreasing
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12
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4, 16, 16, 50, 160, 64, 130, 984, 1600, 256, 296, 4580, 13683, 16000, 1024, 610, 17723, 84132, 186516, 160000, 4096, 1163, 59792, 442089, 1334973, 2596992, 1600000, 16384, 2083, 180821, 2059793, 8073038, 21348990, 37128051, 16000000, 65536, 3544
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OFFSET
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1,1
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COMMENTS
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Table starts
.......4..........16............50............130.............296
......16.........160...........984...........4580...........17723
......64........1600.........13683..........84132..........442089
.....256.......16000........186516........1334973.........8073038
....1024......160000.......2596992.......21348990.......137489538
....4096.....1600000......37128051......356222482......2425304290
...16384....16000000.....537465766.....6172817040.....45275725025
...65536...160000000....7804602744...109166159263....883012703273
..262144..1600000000..113382138975..1947747629183..17667432461262
.1048576.16000000000.1646661944858.34864494529806.358042017265316
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LINKS
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FORMULA
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Empirical: columns k=1..4 have recurrences of order 1,1,25,52 for n>0,0,26,59
Empirical: rows n=1..6 are polynomials of degree 6*n for k>0,0,3,7,11,15
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EXAMPLE
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Some solutions for n=3 k=4
..0..2..2..1....3..0..0..0....0..0..3..2....3..2..1..1....0..1..1..1
..2..2..2..0....1..2..3..0....3..3..2..0....3..2..2..2....1..2..3..0
..3..2..2..1....3..3..2..2....3..3..3..2....2..3..2..2....3..3..0..0
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CROSSREFS
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Column 2 is 16*10^(n-1)
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KEYWORD
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AUTHOR
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STATUS
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approved
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