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A206191
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Number of (n+1)X3 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two
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1
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1012, 18172, 329216, 5972392, 108363344, 1966171084, 35674679732, 647289744976, 11744575881312, 213096317372352, 3866469156691484, 70154115855170420, 1272892598372080320, 23095659424144383792, 419053017449035125152
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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) = 23*a(n-1) -97*a(n-2) +169*a(n-3) -151*a(n-4) +250*a(n-5) -178*a(n-6) +66*a(n-7) -64*a(n-8) +8*a(n-9) +4*a(n-10)
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EXAMPLE
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Some solutions for n=4
..1..0..0....1..3..0....2..1..1....0..1..0....3..2..1....2..3..1....0..2..3
..0..2..1....1..0..1....1..0..3....2..0..1....1..0..2....1..1..3....2..1..1
..2..1..0....2..1..2....2..1..0....2..1..3....3..1..3....3..2..1....0..3..2
..1..3..1....1..3..3....0..2..1....0..2..1....0..2..0....0..3..2....1..0..3
..3..0..2....0..1..0....1..3..2....3..3..2....1..3..2....3..1..3....3..2..0
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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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