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A223053
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Number of 2Xn 0..3 arrays with exactly floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order
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1
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0, 4, 44, 508, 6918, 93770, 1302140, 18203855, 255963118, 3621617164, 51457102852, 733976768254, 10502362067962, 150690052903934, 2167251949580988, 31234643654675360, 450981145373780394, 6522104011884246116
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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..1..0....0..1..2....0..1..0....0..0..1....0..1..0....0..0..1....0..1..0
..1..1..2....2..0..0....1..1..0....1..0..1....2..0..3....2..0..1....2..2..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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