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A203789
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Number of (n+1)X2 0..3 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements
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1
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112, 784, 5488, 38416, 268912, 1882384, 13176688, 92236816, 645657712, 4519603984, 31637227888, 221460595216, 1550224166512, 10851569165584, 75960984159088, 531726889113616, 3722088223795312, 26054617566567184
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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) = 16*7^n
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EXAMPLE
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Some solutions for n=4
..1..1....3..1....2..1....3..1....1..2....1..1....1..3....0..0....3..2....1..0
..2..1....1..3....1..0....3..3....3..1....3..1....2..1....1..0....3..3....0..0
..1..0....2..1....3..1....3..3....3..3....0..3....0..2....0..1....1..3....0..3
..0..3....1..1....0..3....3..1....1..3....1..0....2..1....1..3....1..1....1..0
..0..0....0..1....0..0....1..1....3..3....2..1....1..0....3..0....2..1....1..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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