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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified November 21 16:04 EST 2019. Contains 329371 sequences. (Running on oeis4.)