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A265864
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Number of 3Xn arrays containing n copies of 0..3-1 with no element plus any vertical neighbor equal to 3-1.
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1
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2, 22, 152, 1462, 13772, 139144, 1431824, 15086614, 161254844, 1745205892, 19070813984, 210091931944, 2330150737904, 25993622086384, 291414635747552, 3281265369826774, 37087677409301804, 420618333874721044
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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
..1..2..0..0....0..0..1..1....1..0..2..1....0..2..0..1....2..2..2..2
..0..2..1..1....0..1..2..2....0..0..2..2....0..2..1..0....1..1..1..1
..1..2..0..2....1..0..2..2....0..1..2..1....1..2..2..1....0..0..0..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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