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 A162521 #4 Mar 30 2012 17:34:00 %S A162521 1,4,10,14,25,41,63 %N A162521 Magic numbers A018226 divided by 2. %C A162521 Sequence related to atomic nuclei. %Y A162521 Cf. A018226, A130517, A130556, A130598, A130602, A162522, A162523, A162524, A162525. %K A162521 fini,full,nonn %O A162521 1,2 %A A162521 _Omar E. Pol_, Jul 06 2009