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A250529
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Number of (n+1)X(1+1) 0..3 arrays with nondecreasing max(x(i,j),x(i,j-1)) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction
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1
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110, 700, 3958, 21326, 110546, 559824, 2787971, 13727380, 67045240, 325579124, 1574538204, 7592038724, 36528105991, 175474939818, 841989538667, 4036786501423, 19341925776125, 92633804040283, 443503464714699
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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) = 10*a(n-1) -25*a(n-2) -30*a(n-3) +166*a(n-4) -43*a(n-5) -343*a(n-6) +230*a(n-7) +301*a(n-8) -287*a(n-9) -110*a(n-10) +159*a(n-11) +5*a(n-12) -41*a(n-13) +6*a(n-14) +4*a(n-15) -a(n-16)
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EXAMPLE
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Some solutions for n=5
..0..0....1..0....1..0....0..2....0..0....0..0....0..1....0..1....1..1....0..2
..2..3....0..1....0..2....2..0....0..1....0..0....0..2....1..1....0..3....2..2
..0..3....1..1....0..2....0..2....0..2....0..0....2..3....2..2....0..3....2..3
..3..3....3..2....2..2....2..2....2..1....0..1....1..3....0..2....1..3....2..3
..3..3....1..3....2..2....0..2....1..2....0..1....2..3....2..3....2..3....0..3
..0..3....3..3....0..3....2..3....3..2....0..1....3..2....1..3....2..3....1..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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