This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A199005 #18 Jul 08 2025 20:28:40
%S A199005 1,1,1,5,3,16,6,100,35
%N A199005 Number of inequivalent cocyclic Hadamard matrices of order 4n.
%D A199005 P. O'Cathain and M. Roeder, The Cocyclic Hadamard matrices of order less than 40, Des. Codes Cryptogr. 58 (1) (2011) 73-88.
%H A199005 V. Álvarez, J. A. Armario, M. D. Frau, and F. Gudiel, <a href="https://doi.org/10.1016/j.laa.2011.05.018">The maximal determinant of cocyclic (-1, 1)-matrices over D_{2t}</a>, Linear Algebra and its Applications, 2011, Volume 436, Issue 4, 15 February 2012, Pages 858-873.
%Y A199005 Cf. A007299, A199006, A199007.
%K A199005 nonn,more
%O A199005 1,4
%A A199005 _N. J. A. Sloane_, Nov 01 2011