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 A030380 #8 Dec 30 2018 15:08:55 %S A030380 1,1,3,1,1,1,1,1,2,1,2,5,2,1,1,2,1,1,1,2,1,1,1,2,1,1,1,1,1,1,2,1,1,1, %T A030380 1,1,1,2,1,1,1,1,3,1,1,1,1,1,2,1,1,1,2,1,2,2,3,2,3,7,3,2,2,3,2,2,2,3, %U A030380 2,1,1,2,1,1,1,1,3,1,1,1,1,1,2,1,1,1,2,1,1,1 %N A030380 Length of n-th run of digit 1 in A030373. %t A030380 Length/@Select[Split[Flatten[IntegerDigits[Range[200],4]]],MemberQ[#,1]&] (* _Harvey P. Dale_, Dec 30 2018 *) %K A030380 nonn,base %O A030380 1,3 %A A030380 _Clark Kimberling_