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 A075488 #8 Oct 15 2013 22:31:31
%S A075488 2,4,11,10,97,96,33,32,44,43,135,134,133,132,100,99,191,190,140,139,
%T A075488 262,261,428,427,395,394,331,330,391,390,389,388,462,461,460,459,458,
%U A075488 457,456,455,454,453,501,500,499,498,497,496,495,494,493,492,747,746
%N A075488 Length of iteration list when Collatz-function is iterated with initial value -1+3^n.
%C A075488 n=3, -1+3^n = 26, list = {26,13,40,20,10,5,16,8,4,2,1}, a(3)=11.
%H A075488 T. D. Noe, <a href="/A075488/b075488.txt">Table of n, a(n) for n = 1..1000</a>
%F A075488 a(n) = A008908(3^n-1).
%t A075488 lcoll[n_] := Length[NestWhileList[If[EvenQ[#], #/2, 3 # + 1] &, n, # > 1 &]]; Table[lcoll[3^i - 1], {i, 54}] (* _Jayanta Basu_, Jun 15 2013 *)
%Y A075488 Cf. A006370, A008908, A074472, A075484-A075487.
%K A075488 nonn
%O A075488 1,1
%A A075488 _Labos Elemer_, Sep 26 2002