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 A097396 #3 Nov 10 2007 03:00:00 %S A097396 2,5,31,283,3381,49781,870199,17600759,404197705,10387420489 %N A097396 Duplicate of A056788. %K A097396 dead %O A097396 1,1