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 A077270 #3 May 11 2007 03:00:00 %S A077270 1,4,11,26,52,109,237,556,1405,3690,10085,28157,80071,230568,670122 %N A077270 Duplicate of A076048. %K A077270 dead %O A077270 0,2