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 A239090 #8 Jun 09 2016 10:38:48 %S A239090 1,2,3,4,5,6,7,8,9,11,111,1111,11111,111111,1111111,11111111, %T A239090 111111111,1111111111,11111111111,111111111111,1111111111111, %U A239090 11111111111111,111111111111111,1111111111111111,11111111111111111,111111111111111111 %N A239090 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 A239090 Computed by Lars Blomberg. %D A239090 Eric Angelini, Posting to Sequence Fans Mailing List, Sep 28 2013 %H A239090 Eric Angelini, <a href="http://www.cetteadressecomportecinquantesignes.com/LittleEqualGreat.htm">Less than <, Equal to =, Greater than ></a> (see sequence Sp) %H A239090 Eric Angelini, <a href="/A239083/a239083.pdf">Less than <, Equal to =, Greater than ></a> [Cached copy, with permission of the author] %Y A239090 The sequences in this family are given in A239083-A239086, A239136-A239139, A239087-A239090, A239215-A239218, A239235. %K A239090 nonn,base %O A239090 1,2 %A A239090 _N. J. A. Sloane_, Mar 11 2014