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 A096446 #4 Oct 04 2012 10:28:52 %S A096446 1,1,2,1,2,2,2,3,2,2,4,2 %N A096446 Number of reduced primitive positive definite binary quadratic forms of determinant n. %C A096446 Equivalently, of discriminant -4n. %H A096446 J. H. Conway and N. J. A. Sloane, <a href="http://neilsloane.com/doc/splag.html">Sphere Packings, Lattices and Groups</a>, Springer-Verlag, 3rd edition, 1999, see Table 15.1. %Y A096446 A096445(n) = a(n^2). A006374 gives the number if imprimitive forms are also included. %K A096446 nonn,more %O A096446 1,3 %A A096446 _N. J. A. Sloane_, Aug 11 2004