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 A071161 #5 Sep 08 2013 02:56:21 %S A071161 0,1,11,20,111,120,201,300,1111,1120,1201,1300,2011,2020,3001,4000, %T A071161 11111,11120,11201,11300,12011,12020,13001,14000,20111,20120,20201, %U A071161 20300,30011,30020,40001,50000,111111,111120,111201,111300,112011 %N A071161 Integers whose decimal expansion satisfies the condition that if we read each term from the left to right (the most significant to the least significant digit) then each nonzero digit gives a distance to the next nonzero digit to right (with a cyclic wrap-over from the least-significant to the most significant nonzero digit). %Y A071161 Subset of A071154. The initial portion (up to the 511th term) of this sequence satisfies A071161(n) = A071160(A054429(n)). %K A071161 nonn,base %O A071161 0,3 %A A071161 _Antti Karttunen_, May 14 2002