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A237970
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Number of (n+1) X (4+1) 0..3 arrays with the upper median of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.
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1
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40442, 357672, 2609908, 25087700, 255374826, 2480183866, 24232087766, 242591959184, 2393881373820, 23436165715384, 231406144872410, 2289251323274992, 22505424261636832, 221515001897626222
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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=1
..0..3..1..0..3....3..1..3..2..1....1..1..1..2..1....0..1..2..0..0
..0..1..2..1..2....0..1..2..3..0....2..2..0..3..3....2..3..3..1..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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