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A001121
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Number of doubly-regular tournaments of order 4n-1.
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0
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OFFSET
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2,3
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COMMENTS
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Equally, number of skew digraphs in switching classes of Hadamard matrices of order 4n.
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REFERENCES
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Spence, Edward; Classification of Hadamard matrices of order 24 and 28. Discrete Math. 140 (1995), no. 1-3, 185-243.
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LINKS
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Table of n, a(n) for n=2..7.
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CROSSREFS
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Sequence in context: A131657 A059523 A038623 * A202711 A222668 A210246
Adjacent sequences: A001118 A001119 A001120 * A001122 A001123 A001124
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KEYWORD
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nonn,hard,more,nice,changed
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AUTHOR
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N. J. A. Sloane.
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EXTENSIONS
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Better name suggested by Brendan McKay, Oct 31 2007
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STATUS
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approved
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