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 A003638 M0191 #10 Jan 27 2014 08:57:35 %S A003638 1,1,1,1,1,1,2,2,1,1,3,3,1,1,2,1,3,4,1,2,3,1,1,3,4,2,2,2,1,2,5,2,1,2, %T A003638 1,5,6,1,4,2,7,1,1,3,3,3,4,2,3,5,3,1,1,7,4,2,2,2,2,8,7,2,3,4,4,1,5,3, %U A003638 7,3,1,4,5,3,4 %N A003638 Number of classes per genus in quadratic field with discriminant -4n, -n == 2,3( mod 4). %D A003638 D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989, pp. 224-241. %D A003638 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %Y A003638 Cf. A003637. %K A003638 nonn %O A003638 1,7 %A A003638 _N. J. A. Sloane_, _Mira Bernstein_