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 A064360 #2 Oct 12 2013 15:16:36 %S A064360 1,2,3,5,4,10,6,20,7,34,11,52,15,9,21,8,27 %N A064360 Inverse of sequence A029654 considered as a permutation of the natural numbers. %Y A064360 Cf. A029654. %K A064360 nonn %O A064360 1,2 %A A064360 _Howard A. Landman_, Sep 25 2001