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A204639
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Number of (n+2)X7 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..3 introduced in row major order
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1
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16855, 1860, 760, 1169, 3300, 3077, 9482, 35500, 109224, 410467, 1557742, 5832593, 22104912, 83813366, 317543288, 1203875773, 4564263072, 17303784013, 65603558830, 248722043144, 942974900136, 3575089065983, 13554191912090
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OFFSET
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1,1
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COMMENTS
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Column 5 of A204642
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = 5*a(n-1) -3*a(n-2) -4*a(n-3) -12*a(n-4) +12*a(n-5) +21*a(n-6) -9*a(n-7) -9*a(n-8) for n>10
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EXAMPLE
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Some solutions for n=3
..0..0..0..0..0..0..0....0..0..1..0..1..2..0....0..1..2..2..2..0..0
..0..0..0..0..0..0..0....0..0..1..0..1..2..0....0..2..2..2..0..0..0
..1..1..1..1..1..1..1....0..0..1..0..1..2..0....2..2..2..0..0..0..3
..2..2..2..2..2..2..2....0..0..1..0..1..2..0....2..2..0..0..0..3..3
..1..1..1..1..1..1..1....0..0..1..0..1..2..0....2..0..0..0..3..3..3
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CROSSREFS
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Sequence in context: A061364 A203891 A088164 * A170797 A200973 A190935
Adjacent sequences: A204636 A204637 A204638 * A204640 A204641 A204642
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jan 17 2012
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STATUS
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approved
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