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A187458
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Number of (n+1)X(n+1) 0..1 arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric
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1
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6, 26, 144, 1272, 15192, 286392, 7648032, 314011868, 18986004296, 1725663296600, 237096836118080, 48071903199959400, 15027587384189632928, 6819730931931151055960, 4852231403635188536789728
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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..0..1..1....0..1..0..1....1..0..1..1....1..0..1..0
..1..0..1..0....0..1..0..1....1..0..1..0....0..1..0..1....1..1..1..1
..0..1..0..1....1..0..1..1....1..1..0..1....1..0..1..1....1..0..1..0
..1..0..1..1....0..1..0..1....1..0..1..1....1..1..1..0....0..1..1..1
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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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