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A222651
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Number of nX2 0..3 arrays with no more than floor(nX2/2) elements equal to at least one king-move neighbor, with new values introduced in row major 0..3 order
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1
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1, 7, 60, 724, 7364, 84816, 927152, 10585088, 119198624, 1364437632, 15584195392, 179262541056, 2063988209152, 23852186896896, 276080500860416, 3202923732204544, 37215026284325888, 433119059193262080
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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..1....0..0....0..0....0..0....0..1....0..1....0..1....0..1....0..1
..2..2....2..2....0..1....1..0....1..2....0..0....2..0....2..3....0..2....2..1
..0..1....1..2....2..3....2..3....0..3....2..3....3..0....1..0....3..0....3..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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