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A205620
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Number of (n+1)X3 0..2 arrays with every 2X2 subblock in a row having an equal number of equal diagonal or equal antidiagonal elements, adjacent rows differing in this number, and new values 0..2 introduced in row major order
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1
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50, 306, 2052, 13800, 92934, 625512, 4211904, 28351440, 190894488, 1285019424, 8651903808, 58242716160, 392131883616, 2639804254848, 17772730684416, 119646649486080, 805521704829312, 5422860687684096, 36509097713452032
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OFFSET
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1,1
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COMMENTS
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Column 2 of A205626
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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) = 40*a(n-2) +40*a(n-3) -28*a(n-4) for n>5
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EXAMPLE
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Some solutions for n=4
..0..0..1....0..0..0....0..0..1....0..0..0....0..0..1....0..0..0....0..0..0
..1..0..0....1..2..1....2..0..0....0..1..0....2..2..1....0..0..0....0..0..0
..2..2..1....2..2..2....1..1..1....1..0..1....0..2..2....0..1..0....0..1..0
..0..2..2....0..0..0....2..1..0....0..2..0....1..1..0....1..0..1....1..0..1
..0..1..1....1..0..1....2..1..2....2..0..2....2..1..1....2..0..2....2..1..2
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CROSSREFS
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Sequence in context: A205355 A172519 A046656 * A183698 A183690 A221572
Adjacent sequences: A205617 A205618 A205619 * A205621 A205622 A205623
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jan 29 2012
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STATUS
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approved
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