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A182068
Number of Williamson Hadamard matrices over Z_(2*n+1) X Z^2_2.
1
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
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
KEYWORD
nonn,hard,more
AUTHOR
L. Edson Jeffery, Apr 10 2012
STATUS
approved