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A263626 Number of self-complementary Seidel matrices of order n. 0
1, 1, 0, 1, 1, 4, 0, 19, 10, 360, 0, 25112 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

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: A058348 A184946 A085618 * A076021 A282579 A283012

Adjacent sequences:  A263623 A263624 A263625 * A263627 A263628 A263629

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Oct 24 2015

STATUS

approved

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Last modified April 6 20:39 EDT 2020. Contains 333286 sequences. (Running on oeis4.)