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A191482
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Number of n X n symmetric binary matrices with each 1 adjacent to no more than 6 king-move neighboring 1s
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1
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2, 8, 61, 932, 28310, 1702795, 202939372, 47927020569, 22429704522082, 20801275290690832, 38227523793468047029, 139214024121151998219523, 1004640378392088270863934462, 14366768178214114259445967952070
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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..1..0..0....1..1..0..1....1..0..0..0....1..0..1..0....1..1..1..0
..1..0..1..1....1..1..1..0....0..0..1..1....0..0..1..1....1..1..0..1
..0..1..1..0....0..1..0..1....0..1..1..1....1..1..1..1....1..0..1..0
..0..1..0..0....1..0..1..1....0..1..1..0....0..1..1..0....0..1..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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