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A181238
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Number of (4*n)X4 binary matrices with all row sums equal and all column sums equal
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1
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140, 49772, 33235358, 27896484332, 26012734507190, 25785064658274014, 26631749414632177802, 28342597507242978860012, 30862541359435652055581702, 34221243248277031078812700022, 38507504930060734566868274154362
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for 4X4
..1..1..0..1....1..1..0..0....0..1..0..1....0..1..0..0....1..0..0..1
..1..0..1..1....0..0..1..1....1..0..0..1....0..0..0..1....1..1..0..0
..0..1..1..1....1..0..0..1....0..1..1..0....0..0..1..0....0..0..1..1
..1..1..1..0....0..1..1..0....1..0..1..0....1..0..0..0....0..1..1..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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