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 A074150 #3 Nov 10 2007 03:00:00 %S A074150 1,2,3,6,9,14,19,26,33,42,51,62,73,86,99,114,129,146,163,182,201,222 %N A074150 Duplicate of A061925. %K A074150 dead %O A074150 0,2