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 A123065 #4 Mar 30 2012 16:50:32 %S A123065 2,4,5,7,10,14,16,19,20,25,28,32 %N A123065 Numbers primitively represented by the quadratic form 2 x^2 + xy + 4 y^2. %D A123065 J. H. Conway, The Sensual (Quadratic) Form, M.A.A., 1997, p. 82. %Y A123065 Cf. A123063, A123064, A123067, A123068. %K A123065 nonn %O A123065 1,1 %A A123065 _N. J. A. Sloane_, Sep 27 2006