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A215900
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Number of diagonal 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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2, 2, 15, 42, 726, 2906, 84550, 433252, 18378580, 113503692, 6485270720, 46538017584, 3404551437592, 27700815674032, 2504332323669064, 22702140562948192, 2470653950084307472, 24626774613248937584
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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=3
..0..x..1....0..x..1....0..x..1....0..x..1....0..x..0....0..x..1....0..x..0
..x..2..x....x..2..x....x..2..x....x..2..x....x..1..x....x..2..x....x..1..x
..1..x..3....3..x..0....3..x..4....1..x..1....0..x..0....1..x..0....2..x..3
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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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