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A219900
Number of ACT classes of Butson-type Hadamard matrices of order 2n over 4th roots of unity.
1
1, 2, 1, 10, 7, 167, 298
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
P. H. J. Lampio and F. Szollosi,
Quaternary complex Hadamard matrices.
P. H. J. Lampio, F. Szollosi and Patric R. J. Östergård,
The quaternary complex Hadamard matrices of orders 10, 12, and 14
, Discrete Math., 313 (2012), 189-206.
CROSSREFS
Cf.
A219899
.
Sequence in context:
A081099
A213252
A122017
*
A136233
A113088
A060694
Adjacent sequences:
A219897
A219898
A219899
*
A219901
A219902
A219903
KEYWORD
nonn
,
more
AUTHOR
N. J. A. Sloane
, Dec 12 2012
STATUS
approved
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Last modified May 19 02:48 EDT 2024. Contains 372666 sequences. (Running on oeis4.)