A263627 Number of Seidel matrices of order n with minimal eigenvalue -5.

0, 0, 0, 0, 0, 1, 2, 8, 33, 306, 6727, 219754

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