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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,4

LINKS

Table of n, a(n) for n=3..12.

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

Adjacent sequences:  A263621 A263622 A263623 * A263625 A263626 A263627

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Oct 24 2015

STATUS

approved

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Last modified March 29 05:39 EDT 2020. Contains 333105 sequences. (Running on oeis4.)