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A269480
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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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4, 54, 574, 6404, 72110, 816583, 9323584, 107089479, 1236171969, 14324836704, 166516037345, 1940477033553, 22659370920439, 265044574417791, 3104569328697374, 36408281098910933, 427405044547342278
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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..0..1..0. .1..1..0..0. .2..0..1..2. .2..0..1..1. .1..0..2..0
..2..1..1..0. .2..1..0..0. .2..0..1..2. .2..0..2..2. .1..2..1..0
..0..2..2..1. .1..2..2..2. .1..1..0..0. .0..1..0..1. .0..2..1..2
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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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