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 A073021 #5 Jan 24 2006 03:00:00 %S A073021 1,1,2,3,5,11,17,29,47,79,127,211,347,563,911,1481,2393,3877,6271, %T A073021 10151,16427,26591,43019,69623,112643,182279,294923,477209,772139, %U A073021 1249361,2021501,3270863,5292367,8563237,13855607,22418849,36274471 %N A073021 Apart from initial 0, same as A055498. %K A073021 dead %O A073021 0,3