|
| |
|
|
A048615
|
|
Numerator of mass (Sum 1/|Aut(H)|) of Hadamard matrices of order 4n.
|
|
5
| | |
|
|
|
OFFSET
| 1,4
|
|
|
COMMENTS
| This list starts with the Hadamard matrix of order 4. The masses of the Hadamard matrices of orders 1 and 2 are 1/2 and 1/8 respectively.
|
|
|
REFERENCES
| V. Alvarez, J. A. Armario, M. D. Frau and F. Gudlel, The maximal determinant of cocyclic (-1, 1)-matrices over D_{2t}, Linear Algebra and its Applications, 2011, in press; doi:10.1016/j.laa.2011.05.018
|
|
|
LINKS
| 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. A048616, A007299, A036297.
Sequence in context: A044359 A044740 A026917 * A124955 A126414 A183427
Adjacent sequences: A048612 A048613 A048614 * A048616 A048617 A048618
|
|
|
KEYWORD
| frac,nonn,hard,nice,changed
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), E. M. Rains
|
|
|
EXTENSIONS
| a(8) from Brendan McKay, Feb 11 2012
|
| |
|
|
