This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A086479 #4 Mar 30 2012 17:26:50 %S A086479 0,0,3,0,15,12,77,32,261,260,1023,1056,4095,6552,19905,15872,66045, %T A086479 97740,262143,321320,1404375,1391720,4198397,6108912,17619525, %U A086479 23153832,79255071,116921224,268435455,529405320,1259979965,1408246784 %N A086479 Number of invertible circulant (0,1) matrices over the reals that have even determinant. %F A086479 a(n) = A086323(n) - A003473(n) %Y A086479 Cf. A003473, A086323, A086324. %K A086479 nonn %O A086479 1,3 %A A086479 Yuval Dekel (dekelyuval(AT)hotmail.com), Sep 09 2003 %E A086479 More terms from _Max Alekseyev_, Sep 25 2009