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A281198
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Number of n X n 0..1 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.
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0
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0, 2, 56, 270, 1141, 4248, 14375, 45614, 138676, 409976, 1190740, 3421202, 9767347, 27782656, 78849645
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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..1..0..1. .0..1..0..1. .0..0..1..1. .0..1..1..0. .0..1..0..1
..0..0..1..0. .1..1..0..0. .1..0..1..0. .0..0..1..0. .0..1..0..0
..1..0..1..0. .0..1..1..0. .1..0..1..0. .1..0..1..1. .0..1..0..1
..1..0..1..1. .0..0..1..0. .1..0..1..0. .0..1..0..0. .0..1..0..0
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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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