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A209459
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Number of nX2 0..6 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..6 introduced in row major order
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1
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2, 6, 57, 700, 10676, 192994, 3966581, 89157292, 2122477292, 52308803176, 1315354516436, 33456562887760, 856485703088336, 22005434702222368, 566526069249475088, 14601678389694957760, 376583948372941600448
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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) = 44*a(n-1) -456*a(n-2) -1360*a(n-3) +25892*a(n-4) +16752*a(n-5) -259776*a(n-6) -406080*a(n-7) -129600*a(n-8) for n>9
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EXAMPLE
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Some solutions for n=4
..0..0....0..0....0..0....0..0....0..1....0..0....0..0....0..0....0..0....0..0
..1..2....1..2....1..2....1..2....0..2....1..2....1..2....1..2....1..2....1..2
..0..0....0..0....2..3....0..1....1..0....3..1....3..1....0..1....0..0....1..0
..3..4....1..2....0..0....1..2....0..2....0..0....4..4....0..2....3..1....2..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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