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A274747
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Number of nX6 0..2 arrays with no element equal to any value at offset (-1,-2) (0,-1) or (-1,0) and new values introduced in order 0..2.
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1
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16, 164, 2017, 25585, 327123, 4190533, 53680592, 687685512, 8809672678, 112857546696, 1445776873145, 18521322045287, 237269920345659, 3039578666135430, 38938936908037372, 498832560169009277
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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) = 14*a(n-1) -10*a(n-2) -80*a(n-3) +177*a(n-4) -152*a(n-5) +56*a(n-6) -a(n-7) -5*a(n-8) +a(n-9) for n>11
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EXAMPLE
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Some solutions for n=4
..0..1..2..1..0..2. .0..1..2..1..0..1. .0..1..2..1..2..1. .0..1..0..1..0..1
..1..0..1..0..1..0. .1..0..1..0..1..0. .1..2..1..2..1..2. .1..0..1..2..1..2
..0..1..0..2..0..2. .0..1..2..1..0..2. .2..0..2..1..0..1. .0..1..2..1..0..1
..2..0..1..0..2..1. .2..0..1..0..1..0. .0..2..0..2..1..0. .1..2..1..0..1..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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