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A303676
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Number of n X n 0..1 arrays with every element unequal to 0, 1 or 3 king-move adjacent elements, with upper left element zero.
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0
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1, 5, 9, 28, 76, 177, 367, 774, 1684, 3639, 7597, 15617, 32101, 66074, 135096, 274104, 553668, 1116275, 2245277, 4501938, 9000074, 17953486, 35749382, 71056212, 140977366, 279246077, 552333115, 1091040731
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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..1..0. .0..1..1..0..0. .0..0..0..0..1. .0..0..0..1..1
..0..1..1..1..1. .1..1..1..1..0. .0..0..0..0..0. .0..0..0..0..1
..1..1..1..1..1. .1..1..1..1..1. .0..0..0..0..0. .0..0..0..0..0
..1..1..1..1..1. .1..1..1..1..1. .0..0..0..0..0. .0..0..0..0..0
..1..1..1..1..0. .0..1..1..1..1. .1..0..0..0..0. .0..0..0..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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