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A192258
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Number of n X n symmetric binary matrices with each element either the sum mod 2 of its horizontal neighbors or the sum mod 2 of its vertical neighbors
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1
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1, 2, 3, 10, 52, 305, 3336, 53160, 1210187, 43234473, 2296063392, 180971357507, 21523051916415, 3822241812458992, 1013512678870403979, 402404564958432626790, 238779216876700299752228
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OFFSET
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1,2
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LINKS
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EXAMPLE
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Some solutions for 5X5
..1..1..0..1..1....1..1..0..0..0....1..1..0..1..1....0..0..0..1..0
..1..1..0..0..0....1..1..0..1..0....1..0..1..1..0....0..0..0..1..0
..0..0..0..0..0....0..0..1..1..0....0..1..1..0..1....0..0..0..0..0
..1..0..0..0..0....0..1..1..1..0....1..1..0..1..1....1..1..0..0..0
..1..0..0..0..0....0..0..0..0..0....1..0..1..1..1....0..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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