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A096201 Number of Hadamard matrices of order 4n when a matrix and its transpose are considered equivalent. 6
1, 1, 1, 1, 4, 3, 36, 294, 6857010 (list; graph; refs; listen; history; internal format)
OFFSET

0,5

COMMENTS

More precisely, number of inequivalent Hadamard matrices of order n if two matrices are considered equivalent if one can be obtained from the other by permuting rows, permuting columns, multiplying rows or columns by -1 and possibly transposing.

Computed from the tables on the linked website.

LINKS

N. J. A. Sloane, Tables of Hadamard matrices

Index entries for sequences related to Hadamard matrices

CROSSREFS

Cf. A007299.

Sequence in context: A013558 A161000 A120078 * A025175 A016504 A013335

Adjacent sequences:  A096198 A096199 A096200 * A096202 A096203 A096204

KEYWORD

nonn,hard,nice,changed

AUTHOR

Ian Wanless (Ian.Wanless(AT)cs.anu.edu.au), Jul 28 2004

EXTENSIONS

a(8) from Brendan McKay, Feb 11 2012

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Last modified February 17 23:05 EST 2012. Contains 206085 sequences.