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 A077277 #4 May 11 2007 03:00:00 %S A077277 5,23,101,109,263,211,251,757,1367,941,2053,1901,911,2347,1861,1187 %N A077277 Duplicate of A073682. %K A077277 dead %O A077277 1,1