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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
| 2,3
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COMMENTS
| Equally, number of skew digraphs in switching classes of Hadamard matrices of order 4n.
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REFERENCES
| Spence, Edward; Classification of Hadamard matrices of order 24 and 28. Discrete Math. 140 (1995), no. 1-3, 185-243.
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CROSSREFS
| Sequence in context: A131657 A059523 A038623 * A202711 A116567 A087541
Adjacent sequences: A001118 A001119 A001120 * A001122 A001123 A001124
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KEYWORD
| nonn,hard,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Better name suggested by Brendan McKay, Oct 31 2007
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