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 A084521 #8 Jul 29 2017 13:05:28 %S A084521 3,4,2,4,4,1,5,2,2,5,3,1,4,4,4,0,4,5,3,0,5,2,4,1,5,3,4,0,5,5,1,1,5,5, %T A084521 2,0,6,2,2,2,6,2,3,1,6,3,1,2,6,3,3,0,6,4,1,1,6,4,2,0,4,5,5,0,1,4,6,1, %U A084521 3,1,4,6,4,0,1,5,2,4,4,0,5,2,5,3,0,5,3,5,0,2,5,5,1,4,0,5,5,5,0,0,5,6,1,1,2 %N A084521 An infinite juggling sequence of three balls: successively larger 'prime' ground-state 3-ball site swaps listed in lexicographical order. A subset of A084511. %C A084521 A juggling sequence is defined as 'prime', if it does not visit any state more than once. This means that in A084523 no integer occurs twice between consecutive sevens. %H A084521 A. Karttunen, <a href="/A084507/a084507.scm.txt">Scheme-program for computing this sequence</a> %H A084521 <a href="/index/J#Juggling">Index entries for sequences related to juggling</a> %e A084521 The successive site swaps are: 3; 4,2; 4,4,1; 5,2,2; 5,3,1; 4,4,4,0; 4,5,3,0; ... See A084522. %Y A084521 The number of such site swaps of length n is given by A084529. First position where n appears: A084527. %K A084521 nonn,tabf %O A084521 1,1 %A A084521 _Antti Karttunen_, Jun 02 2003