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 A027320 #6 Nov 10 2007 03:00:00 %S A027320 1,3,8,20,120,432,1512,5184,17496,58320,192456,629856,2047032 %N A027320 Duplicate of A027319. %K A027320 dead %O A027320 0,2