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 A226609 #10 Jun 19 2013 13:49:31
%S A226609 2,3,5,5,27,27,4,6,14,4,24,8,8,8,8,8,8,8,7,31,11,5,5,43,16,8,5,17,65,
%T A226609 65,23,8,8,6,6,6,20,11,18,28,7,7,7,7,7,38,29,12,6,28,28,10,10,10,10,
%U A226609 10,10,6,66,24,30,10,10,27,27,27,27,27,12,60,15,38
%N A226609 Irregular array read by rows. a(n) is the length of the primitive Collatz-like 3x+k cycle associated with A226607(n).
%H A226609 Geoffrey H. Morley, <a href="/A226609/b226609.txt">Rows 1..2032 of array, flattened</a>
%e A226609 The irregular array starts:
%e A226609 (k=1) 2;
%e A226609 (k=5) 3, 5, 5, 27, 27;
%e A226609 (k=7) 4;
%e A226609 (k=11) 6, 14;
%e A226609 a(2)=3 is the length of the 3x+5 cycle {1,4,2} associated with A226607(2)=1.
%Y A226609 Row n begins with a(A226612(n)) and has length A226613(n).
%Y A226609 The cycle associated with a(n) has A226610(n) odd elements of which A226608(n) is the largest.
%Y A226609 Cf. A226611, A226625, A226670-A226672.
%K A226609 nonn,tabf
%O A226609 1,1
%A A226609 _Geoffrey H. Morley_, Jun 13 2013