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 A088169 #6 Mar 30 2012 17:27:41
%S A088169 0,2,4,6,8,11,22,33,44,55,66,77,88,99,101,141,161,181,201,202,221,222,
%T A088169 241,242,261,262,281,282,302,303,322,323,342,343,362,363,382,383,403,
%U A088169 404,423,424,443,444,463,464,483,484,504,505,524,525,544,545,564,565
%N A088169 Numbers n such that the set S(n) = {k: k + reverse(k) = n} is not empty and all elements of S(n) have the same number of digits as n.
%C A088169 Subsequence of A067030.
%H A088169 <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a>
%e A088169 404 is a term since S(404) = {103, 202, 301, 400}.
%Y A088169 Cf. A067030, A088170, A088171.
%K A088169 nonn,base
%O A088169 1,2
%A A088169 _Klaus Brockhaus_, Sep 21 2003