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A187525
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Number of (n+1)X(n+1) 0..1 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation
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0
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6, 0, 104, 0, 9346, 0, 4278774, 0, 9966039904, 0, 118222727145122, 0, 7149579817467705382, 0, 2205539783282634028931328
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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
..0..1..0..1....1..1..0..1....1..0..1..1....1..0..1..0....1..1..0..1
..1..0..1..0....1..0..1..0....0..1..0..1....0..1..0..1....1..0..1..1
..0..1..1..1....0..1..0..1....1..0..1..0....1..1..1..0....1..1..0..1
..1..0..1..0....1..1..1..1....0..1..1..1....0..1..0..1....1..0..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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