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A298049
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Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero.
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0
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0, 3, 15, 40, 121, 512, 1708, 7014, 35804, 201703, 1158266, 7391098, 54852360
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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=5
..0..0..1..0..0. .0..0..0..1..0. .0..0..0..1..0. .0..1..1..1..0
..1..1..0..1..1. .1..1..1..0..1. .1..1..1..0..0. .1..0..0..0..1
..0..1..1..1..0. .0..1..1..0..0. .0..0..0..0..0. .0..0..1..0..0
..0..1..0..1..0. .0..1..1..1..1. .0..1..0..1..0. .1..1..0..1..1
..1..0..1..0..1. .1..1..1..0..0. .1..1..0..1..1. .1..0..1..0..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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