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A206707 Order of largest automorphism group of a Hadamard matrix of order 4n. 0
192, 21504, 190080, 10321920, 6840, 760320, 58968, 20478689280 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Automorphisms are row/column permutations and negations that return the original matrix.  The smallest possible order is 2.

LINKS

Table of n, a(n) for n=1..8.

Index entries for sequences related to Hadamard matrices

CROSSREFS

Sequence in context: A205760 A035833 A048616 * A199007 A199006 A001290

Adjacent sequences:  A206704 A206705 A206706 * A206708 A206709 A206710

KEYWORD

nonn,more

AUTHOR

Brendan McKay, Feb 11 2012

STATUS

approved

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Last modified July 2 08:02 EDT 2020. Contains 335398 sequences. (Running on oeis4.)