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 A239136 #13 Jun 09 2016 10:39:53 %S A239136 1,2,10,3,11,101,102,12,13,14,4,15,5,16,6,17,7,18,8,19,9,20,21,22,103, %T A239136 23,24,25,26,27,28,29,30,31,32,33,104,34,35,36,37,38,39,40,41,42,43, %U A239136 44,105,45,46,47,48,49,50,51,52,53,54,55,106,56,57,58,59,60 %N A239136 The sequence S = a(1), a(2), ... is defined by a(1)=1, if d,e,f are consecutive digits then we do not have d <= e < f, and S is always extended with the smallest integer not yet present in S. %C A239136 Computed by Lars Blomberg. %D A239136 Eric Angelini, Posting to Sequence Fans Mailing List, Sep 28 2013 %H A239136 Eric Angelini, <a href="http://www.cetteadressecomportecinquantesignes.com/LittleEqualGreat.htm">Less than <, Equal to =, Greater than ></a> (see sequence Sf) %H A239136 Eric Angelini, <a href="/A239083/a239083.pdf">Less than <, Equal to =, Greater than ></a> [Cached copy, with permission of the author] %Y A239136 The sequences in this family are given in A239083-A239086, A239136-A239139, A239087-A239090, A239215-A239218, A239235. %K A239136 nonn,base %O A239136 1,2 %A A239136 _Michel Marcus_, Mar 11 2014