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A233983
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Number of (n+1)X(2+1) 0..4 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 10, and no two adjacent values equal
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1
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236, 1540, 9632, 62040, 393396, 2520604, 16042420, 102569896, 653740236, 4175880380, 26632556736, 170044378852, 1084833846436, 6924940011112, 44186146407404, 282025989515940, 1799679817590096, 11486087605706420
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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) +53*a(n-2) -116*a(n-3) -892*a(n-4) +1620*a(n-5) +5804*a(n-6) -9766*a(n-7) -13812*a(n-8) +23148*a(n-9) +8224*a(n-10) -16848*a(n-11) +2560*a(n-12) +256*a(n-13)
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EXAMPLE
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Some solutions for n=4
..1..2..4....2..3..4....2..3..2....3..1..3....4..3..2....0..2..4....2..3..2
..3..1..3....0..1..3....0..2..0....4..2..4....3..1..3....2..1..2....3..1..3
..2..0..2....2..0..2....2..3..2....2..1..3....1..0..1....4..3..4....4..2..1
..3..1..3....0..1..3....3..1..0....4..3..2....3..1..3....3..1..3....3..1..3
..1..2..1....2..0..2....2..3..2....3..1..0....2..0..2....2..0..1....2..0..2
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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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