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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
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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 May 19 00:35 EDT 2024. Contains 372666 sequences. (Running on oeis4.)