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A206704 Number of Hadamard matrices of order 4n that are equivalent to their transpose. 1
1, 1, 1, 3, 3, 12, 101, 3993 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Number of equivalence classes under row/column permutation and negation that contain the transpose.

LINKS

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

Index entries for sequences related to Hadamard matrices

FORMULA

a(n) = 2*A096201(n) - A007299(n).

CROSSREFS

Cf. A007299, A036297, A096201, A206705.

Sequence in context: A014432 A107330 A076509 * A020550 A306529 A200921

Adjacent sequences:  A206701 A206702 A206703 * A206705 A206706 A206707

KEYWORD

nonn,more

AUTHOR

Brendan McKay, Feb 11 2012

STATUS

approved

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Last modified August 4 16:25 EDT 2021. Contains 346447 sequences. (Running on oeis4.)