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A267619
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Number of 3 X n arrays containing n copies of 0..3-1 with every element equal to at least one horizontal or antidiagonal neighbor and the top left element equal to 0.
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1
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0, 2, 8, 42, 576, 5492, 68958, 814418, 9982880, 122186774, 1509756240, 18739734568, 233756282022, 2928054874344, 36812296612552, 464358008157458, 5874864170778700, 74526122250575078, 947703833383753558
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..0..2..0....0..0..2..2....0..0..1..1....0..0..2..2....0..0..0..0
..2..2..0..1....1..1..0..0....0..0..2..2....1..1..0..0....2..2..1..1
..2..1..1..1....1..1..2..2....1..1..2..2....2..2..1..1....2..2..1..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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