A048616 Denominator of mass (Sum 1/|Aut(H)|) of Hadamard matrices of order 4n.
192, 21504, 190080, 573440, 218880, 40480, 2106, 53329920
Offset: 1
Examples
1/192, 1/21504, 1/190080, 27/573440, 127/218880, 34603/40480, 278617/2106, 264156210586399/53329920, ...
Links
- 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
Extensions
a(8) from Brendan McKay, Feb 11 2012