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A191295
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Number of n X n symmetric binary matrices with each 1 adjacent to exactly 2 knight-move neighboring 1s
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0
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1, 1, 2, 17, 61, 241, 1077, 10002, 130992, 2166639, 41299118, 1000354787, 34454184106
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OFFSET
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1,3
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..1..0..0....0..0..0..0....0..1..0..0....1..0..0..1....1..1..1..0
..1..1..0..1....0..0..0..0....1..0..1..1....0..1..1..0....1..0..1..0
..0..0..1..1....0..0..0..0....0..1..1..0....0..1..1..0....1..1..1..0
..0..1..1..0....0..0..0..0....0..1..0..1....1..0..0..1....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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