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A183707
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Number of (n+1)X7 0..3 arrays with every 2X2 subblock nonsingular
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1
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67718760, 401390133264, 2365244332190880, 13954952466340976784, 82311212150455188873408, 485531851352905710505726272, 2863979225676951763894821578784, 16893652701074804322774461983910592
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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 3X7
..0..2..0..2..0..3..1....0..2..0..2..1..3..2....0..2..0..2..2..3..0
..2..0..2..0..2..1..2....2..0..2..0..3..2..2....2..0..2..0..2..2..1
..0..1..0..2..2..0..1....0..1..0..1..2..1..3....0..1..0..2..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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