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A263624
Number of Seidel matrices of order n with exactly three distinct eigenvalues, up to switching equivalence.
0
0, 0, 1, 2, 0, 2, 3, 4, 0, 10
OFFSET
3,4
LINKS
G. Greaves, J. H. Koolen, A. Munemasa, F. Szöllősi, Equiangular lines in Euclidean spaces, arXiv:1403.2155 [math.CO], 2014.
CROSSREFS
Sequence in context: A245230 A284268 A063180 * A141693 A279679 A261096
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Oct 24 2015
STATUS
approved