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 A030346 #12 Mar 14 2023 12:49:23
%S A030346 1,1,1,2,1,1,1,1,2,1,1,1,1,3,2,2,1,1,1,1,1,1,1,1,2,1,1,1,1,2,1,1,1,1,
%T A030346 3,2,2,1,1,1,1,1,1,1,1,2,1,1,1,1,2,1,1,1,1,4,3,3,1,2,2,2,1,2,2,2,2,1,
%U A030346 1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1
%N A030346 Length of n-th run of digit 0 in A030341.
%t A030346 If[#[[1]]==0,Length[#],Nothing]&/@Split[Flatten[Table[Reverse[IntegerDigits[n,3]],{n,0,200}]]] (* _Harvey P. Dale_, Mar 14 2023 *)
%K A030346 nonn,base
%O A030346 1,4
%A A030346 _Clark Kimberling_
%E A030346 Initial 1 inserted for consistency with change in A030341 by _Sean A. Irvine_, Mar 31 2020