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

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

Offset

1,4

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

Table of n, a(n) for n=1..9.

V. Alvarez, J. A. Armario, M. D. Frau, and F. Gudlel, 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.

Sequence in context: A189237 A301494 A053371 * A217415 A213571 A185880

Adjacent sequences: A199002 A199003 A199004 * A199006 A199007 A199008

Keyword

nonn,more

Author

N. J. A. Sloane, Nov 01 2011

Status

approved