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 A081602 #18 Feb 16 2022 11:14:09 %S A081602 1,0,0,1,0,0,1,0,0,2,1,1,1,0,0,1,0,0,2,1,1,1,0,0,1,0,0,3,2,2,2,1,1,2, %T A081602 1,1,2,1,1,1,0,0,1,0,0,2,1,1,1,0,0,1,0,0,3,2,2,2,1,1,2,1,1,2,1,1,1,0, %U A081602 0,1,0,0,2,1,1,1,0,0,1,0,0,4,3,3,3,2,2,3,2,2,3,2,2,2,1,1,2,1,1,3,2,2,2,1,1 %N A081602 Number of 0's in ternary representation of n. %C A081602 Duplicate of A077267. %K A081602 dead %O A081602 0,10 %A A081602 _Reinhard Zumkeller_, Mar 23 2003