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 A080503 #3 Dec 05 2013 19:56:00 %S A080503 1,5,34,253,2024 %N A080503 a(n) = A080502(n)/n. %Y A080503 Cf. A080501, A080502. %K A080503 base,nonn %O A080503 1,2 %A A080503 _Amarnath Murthy_, Mar 19 2003