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 A065365 #2 Mar 30 2012 17:38:10 %S A065365 1,1,2,3,1,2,3,3,4,5,5,6,7,1,2,3,3,4,5,5,6,7,5,6,7,7,8,9,9,10,11,9,10, %T A065365 11,11,12,13,13,14,15,1,2,3,3,4,5,5,6,7,5,6,7,7,8,9,9,10,11,9,10,11, %U A065365 11,12,13,13,14,15,9,10,11,11,12,13,13,14,15,13,14,15,15,16,17,17,18,19 %N A065365 Replace 3^k with 2^k in balanced ternary expansion of n. %C A065365 Notation: (3)<n>(2) %e A065365 5 = +1(9)-1(3)-1(1) -> +1(4)-1(2)-1(1) = 1 = a(5) %Y A065365 A065363, A065366 %K A065365 base,easy,nonn %O A065365 1,3 %A A065365 _Marc LeBrun_, Oct 31 2001