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 A052477 #4 Mar 30 2012 16:48:44 %S A052477 156,204,348,444,492,636,732,1068,1212,1308,1356,1644,1788,1884 %N A052477 Discriminants of real quadratic number fields with class number 2 such that Hilbert class field has splitting field Q(sqrt(3)). %D A052477 H. Cohen, Advanced Topics in Computational Number Theory, Springer, 2000, pp. 534-535. %Y A052477 Cf. A035120, A003656, A052475-... %K A052477 nonn,nice %O A052477 1,1 %A A052477 _N. J. A. Sloane_, Mar 15 2000