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A205433
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Number of (n+1)X2 0..3 arrays with every 2X2 subblock having the same number of equal edges, and new values 0..3 introduced in row major order
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2
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15, 77, 443, 2705, 16955, 108173, 698747, 4558985, 29999531, 198898277, 1327629707, 8915678561, 60198810395, 408431259197, 2782950648923, 19033693298105, 130606895874635, 898770109853333, 6200177355415787
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OFFSET
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1,1
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COMMENTS
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Column 1 of A205440
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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) = 21*a(n-1) -156*a(n-2) +442*a(n-3) -81*a(n-4) -1359*a(n-5) +1134*a(n-6)
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EXAMPLE
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Some solutions for n=4
..0..0....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1
..1..1....2..3....1..2....1..2....0..2....1..0....2..3....1..1....2..0....1..1
..2..2....1..0....0..1....0..3....3..2....0..2....3..2....2..2....1..3....0..1
..0..0....0..3....2..0....3..1....0..2....2..3....1..0....1..1....3..1....1..1
..1..0....3..1....0..3....1..2....1..2....1..0....3..1....3..3....1..3....1..0
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CROSSREFS
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Sequence in context: A205440 A051423 A205609 * A128272 A180579 A081591
Adjacent sequences: A205430 A205431 A205432 * A205434 A205435 A205436
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jan 27 2012
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STATUS
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approved
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