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 A099995 #6 Mar 30 2012 17:37:42
%S A099995 1,3,5,7,9,22,44,66,88,101,121,141,161,181,202,222,242,262,282,303,
%T A099995 323,343,363,383,404,424,444,464,484,505,525,545,565,585,606,626,646,
%U A099995 666,686,707,727,747,767,787,808,828,848,868,888,909,929,949,969,989,1001,1221,1441,1661,1881,2002
%N A099995 Bisection of A002113.
%t A099995 r[n_]:=FromDigits[Reverse[IntegerDigits[n]]];v={}; Do[If[r[n]==n, v=Append[v, n]], {n, 0, 2200}];Table[v[[2k]], {k, Floor[Length[v]]/2}]
%K A099995 nonn,base,easy
%O A099995 1,2
%A A099995 _N. J. A. Sloane_, Nov 20 2004
%E A099995 Extended with Mathematica program by _Farideh Firoozbakht_, Dec 01 2004