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A093440
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Number of n X n symmetric binary matrices with each element either the sum mod 2 of its diagonal neighbors or the sum mod 2 of its antidiagonal neighbors
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1
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1, 4, 20, 100, 720, 7920, 156960, 4978909, 162844632, 9658482053, 917891979225, 113051563311936, 21440096665285608, 6394092372716939840, 2723634378368868283440, 1747667851609071536512000
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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
..0..0..1..1..0....0..0..1..0..0....1..1..1..1..1....0..0..1..1..1
..0..0..0..1..1....0..1..0..1..0....1..1..1..1..0....0..0..1..1..1
..1..0..1..0..1....1..0..1..1..1....1..1..0..0..0....1..1..0..1..0
..1..1..0..1..0....0..1..1..0..1....1..1..0..0..1....1..1..1..0..0
..0..1..1..0..0....0..0..1..1..0....1..0..0..1..0....1..1..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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