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 A226621 #4 Jul 04 2013 21:17:08 %S A226621 1,1,1,1,1,1,1,1,1,2,2,1,1,2,1,3,1,1,1,3,1,5,5,2,1,1,3,7,1,2,5,7,3,1, %T A226621 1,4,8,1,1,14,14,8,4,1,1,3,12,1,6,2,1,1,14,23,20,12,2,1,1,5,15,29,1,1, %U A226621 1,2,5,5,42,34,25,14,5,1,1,5,16,28,2,9,1,1,1 %N A226621 Irregular array read by rows in which a(n) is the number of primitive '3x+k' cycles associated with A226619(n). %C A226621 The terms in row n are associated with cycles of length n (see A226619). %H A226621 Geoffrey H. Morley, <a href="/A226621/b226621.txt">Rows 1..26 of array, flattened</a> %e A226621 The irregular array starts: %e A226621 1, 1; %e A226621 1; %e A226621 1, 1; %e A226621 1, 1, 1; %e A226621 1, 2, 2, 1; %e A226621 1, 2, 1, 3, 1, 1; ... %Y A226621 Cf. A226620. %K A226621 nonn,tabf %O A226621 1,10 %A A226621 _Geoffrey H. Morley_, Jul 02 2013