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A213795
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Number of n X n 0..3 symmetric arrays with every row summing to floor(n*3/2).
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0
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1, 1, 4, 29, 880, 87932, 34725760, 46259653191, 250599609089536, 4664255347861848000, 359514810915617810737152, 96221422835240936091862618254, 107926925135028470351157750883132800, 423270762332675097186733226425581010359872
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OFFSET
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0,3
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..1..2..3....0..1..2..3....3..1..0..2....2..1..1..2....1..3..0..2
..1..0..2..3....1..2..1..2....1..1..2..2....1..2..1..2....3..1..1..1
..2..2..2..0....2..1..2..1....0..2..2..2....1..1..2..2....0..1..2..3
..3..3..0..0....3..2..1..0....2..2..2..0....2..2..2..0....2..1..3..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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EXTENSIONS
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a(0)=1 prepended and terms a(9) and beyond from Andrew Howroyd, Apr 07 2020
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STATUS
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approved
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