A199005 Number of inequivalent cocyclic Hadamard matrices of order 4n.

1, 1, 1, 5, 3, 16, 6, 100, 35

Offset: 1

Author

N. J. A. Sloane, Nov 01 2011

Keywords

• nonn
• more

References

• P. O'Cathain and M. Roeder, The Cocyclic Hadamard matrices of order less than 40, Des. Codes Cryptogr. 58 (1) (2011) 73-88.

Links

• 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.

Crossrefs

Cf. A007299, A199006, A199007.