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 A113585 #7 Aug 24 2022 19:42:48
%S A113585 11,22,33,44,55,66,77,88,99,110,1111,1221,1331,1441,1551,1661,1771,
%T A113585 1881,1991,220,1221,2222,2332,2442,2552,2662,2772,2882,2992,330,1331,
%U A113585 2332,3333,3443,3553,3663,3773,3883,3993,440,1441,2442,3443,4444,4554,4664,4774,4884,4994,550,1551
%N A113585 Numbers formed by arranging the digits of n in increasing order concatenated with arranging the digits in decreasing order.
%C A113585 a(n) is a palindrome if n is not == 0 (mod 10).
%H A113585 Harvey P. Dale, <a href="/A113585/b113585.txt">Table of n, a(n) for n = 1..1000</a>
%e A113585 a(10) = 0110 = 110.
%e A113585 a(12) = 1221.
%e A113585 a(1232) = 12233221
%t A113585 iodo[n_]:=Module[{iod=Sort[IntegerDigits[n]]},FromDigits[Join[iod,Reverse[iod]]]]; Array[iodo,60] (* _Harvey P. Dale_, Aug 24 2022 *)
%Y A113585 Cf. A113586.
%K A113585 base,easy,nonn
%O A113585 1,1
%A A113585 _Amarnath Murthy_, Nov 07 2005
%E A113585 More terms from Jessica Mabel (jem411(AT)psu.edu), Apr 25 2006