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A230467
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Number of nX6 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero
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5
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0, 1260, 552720, 131421154, 33169633760, 8449174734112, 2147475302085202, 545932535826768684, 138787395853893018838, 35282586966210325591794, 8969556441199791857264994, 2280245063727120353993737526
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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=3
..0..0..1..0..1..1....0..0..1..0..1..2....0..0..0..1..0..2....0..0..0..2..0..2
..2..1..1..2..2..0....0..1..2..2..0..0....1..1..2..1..1..2....1..1..2..1..0..2
..0..1..0..2..2..1....0..2..0..1..0..2....0..2..1..0..0..0....0..2..0..1..0..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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