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A191478
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Number of n X n symmetric binary matrices with each 1 adjacent to no more than 2 king-move neighboring 1s
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1
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2, 7, 28, 231, 3022, 63851, 2254102, 129926375, 12346854981, 1930513304865, 496013097993148, 209682700667891310, 145774046555290357339, 166670977286765976049136, 313418443881609705847873703
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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
..1..1..0..1....0..0..0..1....0..0..1..0....0..1..1..1....1..1..0..1
..1..0..0..0....0..1..0..0....0..0..0..1....1..0..0..0....1..0..0..1
..0..0..0..1....0..0..1..0....1..0..0..0....1..0..0..1....0..0..1..0
..1..0..1..0....1..0..0..1....0..1..0..1....1..0..1..1....1..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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