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A086260 Number of symmetric n X n conference matrices. 2
1, 2, 0, 0, 0, 384, 0, 0, 0, 2580480, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
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

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Last modified August 18 08:46 EDT 2022. Contains 356204 sequences. (Running on oeis4.)