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%I
%S 1,1,2,2,37,722
%N Number of doubly-regular tournaments of order 4n-1.
%C Equally, number of skew digraphs in switching classes of Hadamard matrices of order 4n.
%D Spence, Edward; Classification of Hadamard matrices of order 24 and 28. Discrete Math. 140 (1995), no. 1-3, 185-243.
%K nonn,hard,more,nice,changed
%O 2,3
%A _N. J. A. Sloane_.
%E Better name suggested by Brendan McKay, Oct 31 2007
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