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 A069196 #6 Mar 30 2012 18:38:57 %S A069196 1,3,2,5,7,4,11,5,8,13,7,10,17,9,13,11,8,19,9,14,23,37,20,19,13,16,29, %T A069196 15,22,37,59,32,91,41,44,85,43,64,107,57,82,139,221,120,341,461,401, %U A069196 431,416,847,421,634,1055,563,809,686,1495,727,1111,919,1015,967,991 %N A069196 a(1)=1, a(2)=3; for n>1, a(n+2)=(a(n+1)+a(n))/3 if (a(n+1)+a(n)==0 (mod 3)); a(n+2)=(a(n+1)+a(n))/2 if (a(n+1)+a(n)==0 (mod 2)); and a(n+2)=a(n+1)+a(n) otherwise. %C A069196 A Collatz-Fibonacci mixture. Does this sequence diverge to infinity? %Y A069196 Cf. A006369. %K A069196 easy,nonn %O A069196 1,2 %A A069196 _Benoit Cloitre_, Apr 11 2002