A048616 Denominator of mass (Sum 1/|Aut(H)|) of Hadamard matrices of order 4n.

192, 21504, 190080, 573440, 218880, 40480, 2106, 53329920

Offset

1,1

Links

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

V. Alvarez, J. A. Armario, M. D. Frau and F. Gudiel, The maximal determinant of cocyclic (-1, 1)-matrices over D_{2t}, Linear Algebra and its Applications, 2011.

Index entries for sequences related to Hadamard matrices

Example

1/192, 1/21504, 1/190080, 27/573440, 127/218880, 34603/40480, 278617/2106, 264156210586399/53329920, ...

Crossrefs

Cf. A048615, A007299, A036297.

Sequence in context: A205760 A338532 A035833 * A206707 A199007 A199006

Adjacent sequences: A048613 A048614 A048615 * A048617 A048618 A048619

Keyword

frac,nonn,hard,nice

Author

N. J. A. Sloane, E. M. Rains

Extensions

a(8) from Brendan McKay, Feb 11 2012

Status

approved