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 A174781 #17 Jun 14 2012 12:19:17 %S A174781 1,2,4,8,11,12,14,18,21,22,24,28,41,42,44,48,81,82,84,88,111,112,114, %T A174781 118,121,122,124,128,141,142,144,148,181,182,184,188,211,212,214,218, %U A174781 221,222,224,228,241,242,244,248,281,282,284,288 %N A174781 Duplicate of A028846. %K A174781 dead %O A174781 1,2