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A240477
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Number of n X n 0..1 arrays with no element equal to more than two horizontal or vertical neighbors, with new values 0..1 introduced in row major order
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0
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1, 8, 122, 4104, 306749, 50525365, 18384693920, 14778226489840, 26250644316475949, 103046989939554094945, 893993929233158179056828
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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..1..0....0..0..1..0....0..1..1..0....0..1..1..1....0..0..0..1
..1..0..1..0....1..0..1..0....1..1..0..0....1..0..0..1....1..1..0..1
..1..1..0..0....0..0..1..0....0..0..0..1....1..1..0..0....0..0..0..1
..0..1..0..1....1..1..0..0....1..1..1..0....0..1..1..1....0..1..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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