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 A077844 #2 Nov 10 2007 03:00:00 %S A077844 1,3,9,27,79,231,675,1971,5755,16803,49059,143235,418195,1220979, %T A077844 3564819 %N A077844 Duplicate of A077827. %K A077844 dead %O A077844 0,2