A086262 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A086262

Number of n X n conference matrices (including both symmetric and antisymmetric).

%I #8 Oct 08 2021 07:43:42

%S 1,4,0,16,0,384,0,30720,0,2580480,0,1486356480,0

%N Number of n X n conference matrices (including both symmetric and antisymmetric).

%C a(n) = A086260(n) + A086261(n) for n>1.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/C-Matrix.html">C-Matrix</a>

%Y Cf. A086260, A086261.

%K nonn,more

%O 1,2

%A _Eric W. Weisstein_, Jul 14 2003

%E a(9)-a(13) from _Martin Ehrenstein_, Oct 08 2021