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 A003639 M0085 #10 Jan 27 2014 08:57:35 %S A003639 1,1,1,1,1,1,1,1,1,2,1,2,1,1,1,3,3,3,1,3,1,2,1,1,3,2,4,1,1,2,5,1,3,2, %T A003639 1,1,3,3,4,2,2,1,2,1,7,2,5,2,1,5,2,3,1,5,3,6,1,1,4,4,2,7,1,5,1,3,3,3, %U A003639 3,4,4,2,1,3,5,5,1,5,3,1,5,1,7,4,2,3,2,2,5,2,8,7,7,2,2,3,4,5,4,1,1,5,11,3 %N A003639 Number of classes per genus in Q(sqrt -n), n squarefree. %D A003639 D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989, pp. 224-241. %D A003639 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %K A003639 nonn %O A003639 1,10 %A A003639 _N. J. A. Sloane_, _Mira Bernstein_