A182068 Number of Williamson Hadamard matrices over Z_(2*n+1) X Z^2_2.

1, 8, 24, 120, 264, 240, 648, 576

Offset

0,2

Comments

The precise form of Williamson Hadamard matrix is given by Eq. (12) on page 131 of [Baliga, et al.].

Links

Table of n, a(n) for n=0..7.

A. Baliga and K. J. Horadam, Cocyclic Hadamard matrices over Z_t X Z^2_2, Australas. J. Combin. 11(1995), 123-134.

Crossrefs

Cf. A182083.

Sequence in context: A246030 A010566 A305224 * A092771 A279483 A098070

Adjacent sequences: A182065 A182066 A182067 * A182069 A182070 A182071

Keyword

nonn,hard,more

Author

L. Edson Jeffery, Apr 10 2012

Status

approved