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A205992
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Number of (n+1)X3 0..2 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two, and every 2X2 determinant nonzero
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1
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92, 498, 2712, 14866, 81278, 445352, 2436706, 13344256, 73036756, 399888660, 2188990738, 11984113612, 65604360312, 359154388466, 1966148397354, 10763651700178, 58924772138404, 322581389428372, 1765951542920976
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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) = 3*a(n-1) +17*a(n-2) -19*a(n-3) -4*a(n-4) +27*a(n-5) -13*a(n-6) +8*a(n-8) -4*a(n-9) for n>10
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EXAMPLE
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Some solutions for n=4
..2..0..2....2..1..1....2..2..0....2..1..0....1..1..2....2..1..0....1..2..0
..2..1..0....1..0..2....1..0..1....0..2..1....0..2..0....0..2..1....0..2..1
..0..2..1....2..1..0....2..1..0....1..0..2....1..0..1....2..1..0....1..0..2
..2..0..2....0..2..1....1..0..1....2..1..0....0..1..0....1..2..1....2..1..0
..2..1..0....1..0..2....0..2..2....0..2..1....2..0..1....2..0..2....0..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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