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A275261
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Number of nX3 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,-1) and new values introduced in order 0..2.
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1
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5, 54, 128, 396, 1440, 5676, 22844, 93968, 389820, 1626348, 6799728, 28470780, 119289068, 500005184, 2096208716, 8789088828, 36853587936, 154536271820, 648021215772, 2717393443696, 11395105468828, 47784338066636
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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) = 6*a(n-1) -4*a(n-2) -20*a(n-3) +28*a(n-4) -40*a(n-5) +8*a(n-6) +194*a(n-7) -180*a(n-8) +36*a(n-9) +56*a(n-10) -356*a(n-11) +201*a(n-12) +180*a(n-13) -108*a(n-14) for n>17
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EXAMPLE
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Some solutions for n=4
..0..1..1. .0..1..2. .0..1..2. .0..1..2. .0..1..0. .0..1..2. .0..1..0
..1..2..2. .0..1..0. .2..1..2. .2..2..0. .0..1..0. .0..1..0. .0..2..0
..2..2..0. .2..1..0. .0..1..2. .0..1..0. .2..1..2. .2..1..2. .0..2..0
..0..0..1. .0..1..0. .0..1..0. .0..1..0. .0..1..0. .2..1..0. .1..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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