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A267663
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Number of n X 4 0..1 arrays with every repeated value in every row unequal to the previous repeated value, and in every column equal to the previous repeated value, and new values introduced in row-major sequential order.
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1
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5, 50, 500, 3143, 18432, 98438, 508681, 2560344, 12721832, 62688891, 307514468, 1504686646, 7352965785, 35912894408, 175383062746, 856630710989, 4185293733440, 20456112775414, 100023287817835, 489294036823648
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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 recurrence of order 80 (see link above).
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EXAMPLE
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Some solutions for n=6
..0..1..0..0....0..0..1..1....0..1..0..0....0..1..0..0....0..0..1..0
..0..1..0..0....1..0..1..0....0..1..1..0....1..0..0..1....1..0..1..1
..0..1..0..0....1..0..1..1....1..0..1..0....1..1..0..0....0..1..1..0
..0..0..1..0....1..1..0..1....0..1..0..0....0..1..0..1....1..0..1..1
..1..1..0..1....0..0..1..1....0..0..1..0....1..1..0..1....1..0..1..0
..0..1..1..0....1..0..0..1....0..1..0..0....0..0..1..1....1..1..0..1
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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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