A086260 Number of symmetric n X n conference matrices.

1, 2, 0, 0, 0, 384, 0, 0, 0, 2580480, 0, 0, 0

Offset

1,2

Links

Table of n, a(n) for n=1..13.

Eric Weisstein's World of Mathematics, C-Matrix

Crossrefs

Cf. A086261, A086262.

Sequence in context: A193542 A193545 A336399 * A124505 A326855 A025444

Adjacent sequences: A086257 A086258 A086259 * A086261 A086262 A086263

Keyword

nonn,more

Author

Eric W. Weisstein, Jul 14 2003

Extensions

a(9)-a(13) from Martin Ehrenstein, Oct 07 2021

Status

approved