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A265857
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Number of 3Xn arrays containing n copies of 0..3-1 with no element plus any horizontal or antidiagonal neighbor equal to 3-1.
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1
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6, 10, 30, 42, 154, 478, 2086, 8094, 33766, 139874, 595738, 2519882, 10738874, 45886078, 196936610, 847655270, 3659989354, 15844521472, 68767896826, 299141921948, 1304016379938, 5695400116694, 24919428238882, 109210581420200
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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..2..1..2....2..1..0..0....0..1..2..2....2..2..2..1....0..0..1..0
..1..2..1..0....2..1..0..1....2..2..1..0....2..1..0..0....1..2..1..0
..1..0..0..0....0..1..2..2....1..0..0..1....0..1..0..1....2..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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