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A191604
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Number of n X n symmetric binary matrices with each 1 adjacent to no more than 5 horizontally, vertically or diagonally neighboring 1s
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1
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2, 8, 62, 966, 29888, 1838552, 224969616, 54745613520, 26495136860880, 25502057625872912, 48817512227401500592, 185852155121293444267024, 1407184656492293192061559200, 21189763355834331020518358995456
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OFFSET
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1,1
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..0..1..1....1..1..1..1....1..1..1..1....1..0..0..0....1..0..1..1
..0..1..0..1....1..1..1..0....1..0..1..1....0..1..1..1....0..0..1..1
..1..0..0..0....1..1..0..1....1..1..1..0....0..1..0..1....1..1..0..0
..1..1..0..1....1..0..1..0....1..1..0..1....0..1..1..1....1..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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