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 A077284 #4 May 11 2007 03:00:00 %S A077284 1,4,13,41,125,367,1111,3395,10491,32670,102231,320990,1010196,3184138 %N A077284 Duplicate of A070428. %K A077284 dead %O A077284 0,2