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A185532
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Number of (n+2) X 9 binary arrays with each 3 X 3 subblock nonsingular.
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1
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915702, 30631134, 989438596, 30654215226, 978050637454, 31056846439654, 981555541329694, 31129923319285058, 986788018195669218, 31261059190076491058, 990735792319754562254, 31398037364368755881486
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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 4 X 9
..0..0..1..0..0..1..0..1..0....0..0..1..0..0..1..1..1..1
..0..1..0..1..1..0..1..1..0....0..1..1..0..1..0..1..0..0
..1..0..0..1..0..0..1..0..1....1..0..0..1..0..1..0..0..1
..0..0..1..1..1..1..0..1..0....0..0..1..0..0..1..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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