%I #9 Oct 08 2021 07:37:09
%S 1,2,0,0,0,384,0,0,0,2580480,0,0,0
%N Number of symmetric n X n conference matrices.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/C-Matrix.html">C-Matrix</a>
%Y Cf. A086261, A086262.
%K nonn,more
%O 1,2
%A _Eric W. Weisstein_, Jul 14 2003
%E a(9)-a(13) from _Martin Ehrenstein_, Oct 07 2021
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