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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
FORMULA
a(n) = 2*A096201(n) - A007299(n).
CROSSREFS
Sequence in context: A014432 A107330 A076509 * A020550 A368960 A306529
KEYWORD
nonn,more
AUTHOR
Brendan McKay, Feb 11 2012
STATUS
approved

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)