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 A097622 #3 Mar 30 2012 18:50:45 %S A097622 1,2,3,4,5,6,6,6,7,10,8,12,10,12,15,9,12,11,10,20,16,16,12,18,15,20, %T A097622 11,21,12,30,16,13,16,21,30,19,20,20,30,30,18,32,18,32,35,24,14,27,21, %U A097622 30,32,35,15,19,40,36,30,24,20,60,16,32,33,24,30,32,17,33,36,60,30,42,18 %N A097622 A097621(A097621(n)). %C A097622 a(A097621(n))=A097621(a(n))=A097623(n). %K A097622 nonn %O A097622 1,2 %A A097622 _Reinhard Zumkeller_, Aug 17 2004