A206704 Number of Hadamard matrices of order 4n that are equivalent to their transpose.

1, 1, 1, 3, 3, 12, 101, 3993

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 A368960 A306529

Adjacent sequences: A206701 A206702 A206703 * A206705 A206706 A206707

Keyword

nonn,more

Author

Brendan McKay, Feb 11 2012

Status

approved