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A233878
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Number of (n+1)X(3+1) 0..2 arrays with every 2X2 subblock having the sum of the squares of all six edge and diagonal differences equal to 11
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1
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240, 1224, 6200, 33656, 178704, 1015656, 5566176, 32573400, 181919416, 1082482200, 6108586496, 36673057320, 208076709744, 1254938417144, 7140038828344, 43162651207096, 245918525589328, 1488348259767656
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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) = 56*a(n-2) -819*a(n-4) +2791*a(n-6) -3096*a(n-8) +961*a(n-10) -84*a(n-12)
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EXAMPLE
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Some solutions for n=5
..0..0..0..2....1..0..1..0....0..2..0..2....0..1..2..1....0..1..2..1
..1..2..1..0....0..2..0..2....2..1..2..1....2..0..0..2....2..0..0..2
..2..0..2..0....2..1..2..1....2..0..2..0....1..2..1..2....1..2..1..0
..1..0..1..0....2..0..2..0....0..1..0..1....0..2..0..2....0..2..0..2
..2..0..2..0....2..1..0..1....2..0..2..0....1..2..1..2....2..1..0..1
..0..1..2..1....0..0..2..0....0..1..0..1....2..0..0..0....0..0..2..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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