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A224587
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Number of (n+6)X13 0..1 matrices with each 7X7 subblock idempotent
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1
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146715, 28629, 29066, 31741, 34107, 35891, 37202, 38192, 43958, 54300, 68099, 84280, 102048, 120877, 140440, 165512, 200668, 249364, 313981, 396105, 496796, 616787, 761586, 941276, 1169396, 1461866, 1836192, 2310940, 2905409, 3644406
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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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FORMULA
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Empirical: a(n) = 4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4) +a(n-7) -3*a(n-8) +3*a(n-9) -a(n-10) for n>16
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EXAMPLE
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Some solutions for n=2
..0..0..0..1..0..0..0..0..0..0..0..0..1
..0..0..0..1..0..0..0..0..0..0..0..0..1
..0..0..0..1..0..0..0..0..0..0..0..0..1
..0..0..0..1..0..0..0..0..0..0..0..0..1
..0..0..0..1..0..0..0..0..0..0..0..0..0
..0..0..0..1..0..0..0..0..0..0..0..0..0
..0..0..0..1..0..0..0..0..0..0..0..0..1
..0..0..0..1..0..0..0..0..0..0..0..0..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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