A199005
Number of inequivalent cocyclic Hadamard matrices of order 4n.
Original entry on oeis.org
1, 1, 1, 5, 3, 16, 6, 100, 35
Offset: 1
- P. O'Cathain and M. Roeder, The Cocyclic Hadamard matrices of order less than 40, Des. Codes Cryptogr. 58 (1) (2011) 73-88.
- V. Álvarez, J. A. Armario, M. D. Frau, and F. Gudiel, The maximal determinant of cocyclic (-1, 1)-matrices over D_{2t}, Linear Algebra and its Applications, 2011, Volume 436, Issue 4, 15 February 2012, Pages 858-873.
A199006
Related to number of Hadamard matrices of order 4n.
Original entry on oeis.org
192, 21504, 190080, 10838016, 16440, 823616, 74306
Offset: 1
- V. Álvarez, J. A. Armario, M. D. Frau, and F. Gudiel, The maximal determinant of cocyclic (-1, 1)-matrices over D_{2t}, Linear Algebra and its Applications, 2011, Volume 436, Issue 4, 15 February 2012, Pages 858-873. See Table 2. The terms a(1)-a(7) are said to be computed from the data from N. J. A. Sloane's website.
- Hadi Kharaghani and Behruz Tayfeh-Rezaie, Hadamard Matrices of Order 32, Journal of Combinatorial Designs, 21 (2013), 212-221; see also preprint.
- N. J. A. Sloane, A Library of Hadamard Matrices.
A199008
Number of cocyclic matrices D_{2n+2} of order 2n+2 with maximal determinant.
Original entry on oeis.org
6, 25, 196, 972, 9680
Offset: 2
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