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 A126969 #2 Mar 31 2012 14:43:40 %S A126969 0,1,2,3,4,5,6,7,8,9,11,12,13,21,111,311,2111,11111,11112,11113,11114, %T A126969 31111 %N A126969 First digit of a(n) is the a(n)-th digit of S [a(n+1) is the smallest available integer not yet present in S, subject to S being monotonically increasing]. %C A126969 An example of what logologists call a "self-acronymic" sequence. %Y A126969 Cf. A126968. %K A126969 nonn,base %O A126969 0,3 %A A126969 _Eric Angelini_, Mar 22 2007