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 A162198 #8 May 03 2017 11:13:16
%S A162198 0,102,104,106,108,202,204,206,208,302,304,306,308,402,404,406,408,
%T A162198 502,504,506,508,602,604,606,608,702,704,706,708,802,804,806,808,902,
%U A162198 904,906,908,11012,11014,11016,11018,11022,11024,11026,11028,11032,11034,11036
%N A162198 Even cyclops numbers.
%H A162198 Harvey P. Dale, <a href="/A162198/b162198.txt">Table of n, a(n) for n = 1..10000</a>
%t A162198 Join[{0},Select[Range[14000],OddQ[IntegerLength[#]]&&EvenQ[#] && DigitCount[ #,10,0] == 1&&IntegerDigits[#][[(IntegerLength[ #]+1)/2]] == 0&]] (* _Harvey P. Dale_, May 03 2017 *)
%Y A162198 Cf. A134808, A134809.
%K A162198 easy,nonn
%O A162198 1,2
%A A162198 _Omar E. Pol_, Jul 04 2009
%E A162198 Corrected by _Harvey P. Dale_, May 03 2017