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A224662
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Number of n X n 0..5 matrices with each 2X2 subblock idempotent
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0
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6, 24, 128, 222, 500, 956, 1876, 3538, 6622, 12200, 22274, 40302, 72418, 129332, 229780, 406378, 715800, 1256248, 2197512, 3832510, 6665570, 11563364, 20012598
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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) = 6*a(n-1) -12*a(n-2) +5*a(n-3) +12*a(n-4) -12*a(n-5) -3*a(n-6) +6*a(n-7) -a(n-9) for n>10
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EXAMPLE
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Some solutions for n=3
..0..0..0....1..1..4....1..0..5....1..1..3....1..0..2....1..0..2....1..0..0
..0..0..0....0..0..0....1..0..1....0..0..0....1..0..1....1..0..1....1..0..1
..2..1..1....0..0..0....0..0..1....5..1..1....2..0..1....4..0..1....3..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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