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 A186306 #5 Mar 31 2012 10:22:17 %S A186306 1,2,5,7,8,9,10,12,14,16,20,22,26,28,32,34,38,42 %N A186306 Records in A186277. %Y A186306 Cf. A186277. %K A186306 nonn %O A186306 1,2 %A A186306 _Artur Jasinski_, Feb 17 2011