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A269647
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Number of 3Xn arrays containing n copies of 0..3-1 avoiding the pattern down-up in every row and equal-up in every column.
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1
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6, 74, 574, 4564, 41526, 419516, 4351224, 45696410, 485785550, 5235947490, 57045797346, 626684612988, 6931703318082, 77128097640376, 862658820597866, 9692104806070332, 109322097799502508, 1237402642148758338
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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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EXAMPLE
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Some solutions for n=4
..2..1..0..0. .0..0..2..2. .2..2..2..0. .0..0..0..2. .0..0..2..1
..2..2..1..1. .1..1..1..1. .0..0..0..2. .1..1..2..2. .1..2..2..1
..0..0..2..1. .2..0..0..2. .1..1..1..1. .0..1..1..2. .0..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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