%I #4 Mar 30 2012 17:26:50
%S 0,0,3,0,15,12,77,32,261,260,1023,1056,4095,6552,19905,15872,66045,
%T 97740,262143,321320,1404375,1391720,4198397,6108912,17619525,
%U 23153832,79255071,116921224,268435455,529405320,1259979965,1408246784
%N Number of invertible circulant (0,1) matrices over the reals that have even determinant.
%F a(n) = A086323(n) - A003473(n)
%Y Cf. A003473, A086323, A086324.
%K nonn
%O 1,3
%A Yuval Dekel (dekelyuval(AT)hotmail.com), Sep 09 2003
%E More terms from _Max Alekseyev_, Sep 25 2009