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 A023751 #13 Apr 02 2014 06:13:51 %S A023751 0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,16,17,20,21,22,23,24,25,26,30,31, %T A023751 32,33,34,35,40,41,42,43,44,50,51,52,53,60,61,62,70,71,80,91,92,93,94, %U A023751 95,96,97,98,101,102,103,104,105,106,107,111,112,113,114,115,116 %N A023751 Plaindromes: numbers whose digits in base 9 are in nondecreasing order. %H A023751 Vincenzo Librandi, <a href="/A023751/b023751.txt">Table of n, a(n) for n = 1..6000</a> %t A023751 Select[Range[0,116],LessEqual@@IntegerDigits[#,9]&] (* _Ray Chandler_, Jan 06 2014 *) %K A023751 nonn,base,easy %O A023751 1,3 %A A023751 _Olivier Gérard_ %E A023751 Change offset to 1 by _Ray Chandler_, Jan 06 2014