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A263627 Number of Seidel matrices of order n with minimal eigenvalue -5. 0
0, 0, 0, 0, 0, 1, 2, 8, 33, 306, 6727, 219754 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..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: A269890 A005040 A191551 * A172448 A268601 A026577

Adjacent sequences:  A263624 A263625 A263626 * A263628 A263629 A263630

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Oct 24 2015

STATUS

approved

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Last modified October 18 01:01 EDT 2018. Contains 316297 sequences. (Running on oeis4.)