2,3
C. Koukouvinos and S. Stylianou, On skew-Hadamard matrices, Discrete Math., 308 (2008), 2723-2731.
Spence, Edward; Classification of Hadamard matrices of order 24 and 28. Discrete Math. 140 (1995), no. 1-3, 185-243.
Sequence in context: A076615 A098777 A127226 * A062282 A012319 A012520
Adjacent sequences: A001116 A001117 A001118 * A001120 A001121 A001122
nonn,hard,nice
N. J. A. Sloane (njas(AT)research.att.com).
