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 A178673 #13 Jul 16 2012 08:40:42 %S A178673 1,229,117805,64647289,35669566217,19690797527709,10870506600976757, %T A178673 6001202979497804657,331304283062403135451,1829008840116358153050197, %U A178673 1009728374600381843221483965 %N A178673 Duplicate of A028452. %K A178673 dead %O A178673 0,2 %A A178673 _Johan de Ruiter_, Dec 25 2010