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A222425
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Number of nX2 0..2 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order
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2
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0, 0, 4, 13, 36, 132, 584, 2054, 7700, 29208, 113024, 428784, 1637248, 6322400, 24241600, 93878180, 360819968, 1402924464, 5410402304, 21069262688, 81508818720, 317854067456, 1233012730240, 4813042237968, 18714480000512
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OFFSET
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1,3
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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....0..0....0..0....0..1....0..0....0..0....0..0....0..0....0..0....0..0
..0..0....1..0....0..0....2..2....1..0....1..1....0..1....0..0....0..0....0..0
..0..1....1..1....1..1....2..2....0..0....1..1....1..1....1..0....1..0....0..1
..0..0....1..1....1..1....2..2....0..0....1..1....1..1....0..0....1..1....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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