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A216340
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Number of horizontal and antidiagonal neighbor colorings of the even squares of a 4Xn array with new integer colors introduced in row major order
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1
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2, 10, 52, 726, 12840, 373780, 12297870, 580853761, 29562890980, 2004648246554, 142953068558998, 12954739605661928, 1216988850964527370, 140585911310155419266, 16679506383419809650408, 2374936932537133281235971
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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=4
..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x
..x..2..x..3....x..2..x..3....x..2..x..3....x..0..x..1....x..2..x..3
..4..x..0..x....4..x..5..x....3..x..1..x....2..x..3..x....0..x..2..x
..x..5..x..3....x..3..x..0....x..3..x..1....x..2..x..1....x..0..x..4
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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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