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A226713
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Number of nX4 (-1,0,1) arrays of determinants of 2X2 subblocks of some (n+1)X5 binary array
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1
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67, 2393, 49019, 977939, 20577215, 439030021, 9326184515, 197633166633, 4188392176965, 88790771781371, 1882395556896109, 39906413076233653, 845997890367543773, 17934778981002807239, 380209955175888381833
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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 n=3
.-1..0.-1..0....0..0..0.-1...-1..1.-1.-1....0.-1.-1..0...-1..0..1.-1
..1.-1..0..0....0..0..0.-1....0..0..0..1...-1..1..1..0....1..0.-1.-1
..0..1..0.-1...-1..0..0..0....1.-1.-1..1....1.-1.-1..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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