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A250996
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Number of (2+1)X(n+1) 0..2 arrays with nondecreasing min(x(i,j),x(i,j-1)) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction
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1
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158, 872, 4007, 16993, 67409, 255502, 934786, 3328627, 11598747, 39713993, 134023188, 446828435, 1474417169, 4822285168, 15651307633, 50458460322, 161715555989, 515580776806, 1636125457220, 5170388337278, 16277908434300
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OFFSET
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1,1
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COMMENTS
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Row 2 of A250994
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = 9*a(n-1) -23*a(n-2) -12*a(n-3) +120*a(n-4) -72*a(n-5) -213*a(n-6) +197*a(n-7) +179*a(n-8) -186*a(n-9) -81*a(n-10) +75*a(n-11) +22*a(n-12) -11*a(n-13) -3*a(n-14)
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EXAMPLE
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Some solutions for n=4
..1..0..2..0..0....0..2..1..1..1....1..1..1..0..1....2..0..0..2..0
..1..0..2..0..2....0..2..2..2..2....1..2..2..1..0....0..2..2..0..2
..1..1..0..2..0....0..2..2..2..2....1..2..2..2..1....0..2..2..1..0
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CROSSREFS
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Sequence in context: A189813 A270791 A180096 * A280483 A252359 A159418
Adjacent sequences: A250993 A250994 A250995 * A250997 A250998 A250999
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Nov 29 2014
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STATUS
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approved
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