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 A239218 #12 Jul 31 2022 07:44:08 %S A239218 1,2,3,4,5,6,7,8,9,10,11,101,20,12,13,14,15,16,17,18,19,21,22,102,30, %T A239218 23,24,25,26,27,28,29,31,32,33,103,40,34,35,36,37,38,39,41,42,43,44, %U A239218 104,50,45,46,47,48,49,51,52,53,54,55,105,60,56,57,58,59,61 %N A239218 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 A239218 Computed by _Lars Blomberg_. %D A239218 Eric Angelini, Posting to Sequence Fans Mailing List, Sep 28 2013 %H A239218 Eric Angelini, <a href="http://www.cetteadressecomportecinquantesignes.com/LittleEqualGreat.htm">Less than <, Equal to =, Greater than ></a> (see sequence Su) %H A239218 Eric Angelini, <a href="/A239083/a239083.pdf">Less than <, Equal to =, Greater than ></a> [Cached copy, with permission of the author] %Y A239218 The sequences in this family are given in A239083-A239086, A239136-A239139, A239087-A239090, A239215-A239218, A239235. %K A239218 nonn,base %O A239218 1,2 %A A239218 _Michel Marcus_, Mar 12 2014