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 A030347 #8 Oct 20 2014 04:24:15
%S A030347 1,3,1,1,2,1,1,5,2,2,1,1,1,1,2,1,1,2,1,1,1,3,1,1,1,2,1,1,3,2,2,7,3,3,
%T A030347 2,2,2,1,1,1,3,1,1,1,2,1,1,1,1,2,1,1,1,1,1,1,2,3,2,1,1,1,1,1,1,2,1,1,
%U A030347 2,1,1,1,3,1,1,1,2,1,1,1,2,1,1,1,1,2,4,1,2,1
%N A030347 Length of n-th run of digit 1 in A030341.
%t A030347 Length/@Select[Split[Flatten[Table[Reverse[IntegerDigits[n,3]],{n,0,100}]]],First[#]==1&] (* _Harvey P. Dale_, Oct 20 2014 *)
%K A030347 nonn,base
%O A030347 1,2
%A A030347 _Clark Kimberling_