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A216333
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Number of horizontal and antidiagonal neighbor colorings of the even squares of an nX3 array with new integer colors introduced in row major order
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1
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1, 2, 15, 52, 877, 4140, 115975, 678570, 27644437, 190899322, 10480142147, 82864869804, 5832742205057, 51724158235372, 4506715738447323, 44152005855084346, 4638590332229999353, 49631246523618756274
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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=4
..0..x..1....0..x..1....0..x..1....0..x..1....0..x..1....0..x..1....0..x..1
..x..2..x....x..2..x....x..2..x....x..0..x....x..2..x....x..2..x....x..2..x
..3..x..0....3..x..1....1..x..2....2..x..0....3..x..2....1..x..0....3..x..4
..x..1..x....x..3..x....x..3..x....x..3..x....x..4..x....x..1..x....x..5..x
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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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