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A297851
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Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 king-move adjacent elements, with upper left element zero.
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0
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0, 3, 15, 30, 45, 131, 181, 298, 430, 1022, 1429, 2164, 2135, 4620, 3680, 9110, 11981, 9540, 87199, 22330, 77938, 182912, 34081
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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=7
..0..0..1..1..1..0..1. .0..0..1..1..0..1..0. .0..1..1..0..0..1..1
..1..1..0..0..0..1..0. .1..1..0..0..1..0..0. .1..0..0..1..1..0..0
..0..1..1..1..1..1..0. .0..0..0..1..0..1..1. .0..1..0..0..0..0..1
..0..1..0..0..0..1..1. .1..1..0..1..0..0..0. .0..1..0..1..1..0..1
..0..1..1..1..1..0..0. .0..1..0..0..1..0..1. .0..1..0..0..0..0..1
..1..1..0..0..0..0..1. .1..0..1..0..1..0..1. .1..0..0..1..1..0..0
..0..0..1..1..1..0..1. .1..0..0..0..1..0..1. .0..1..1..0..0..1..1
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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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