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 A090757 #3 Jan 24 2006 03:00:00 %S A090757 1,3,8,20,49,119,288,696,1681,4059,9800,23660,57121,137903,332928 %N A090757 Duplicate of A048739. %K A090757 dead %O A090757 0,2