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 A228327 #9 Jan 27 2014 12:08:49 %S A228327 0,2,4,6,8,64,20,24,68,642,42,46,86,420,202,424,242,464,246,468,646, %T A228327 864,686,868,6420,2020,2024,2420,2424,2464,2468,6424,6464,6468,6864, %U A228327 6868,64202,4202,4242,4246,4642,4646,4686,8642,42020,20202,42024,20242,42420 %N A228327 Start with 0. Successive digits in the sequence must differ by 2. Adjoin the smallest number not yet in the sequence. %C A228327 Is the sequence infinite? %D A228327 Eric Angelini, Posting to the Sequence Fans Mailing List, Aug 23 2013. %H A228327 Alois P. Heinz, <a href="/A228327/b228327.txt">Table of n, a(n) for n = 1..10000</a> %Y A228327 Cf. A228326, A228328. %K A228327 nonn,base,look %O A228327 1,2 %A A228327 _N. J. A. Sloane_, Aug 24 2013 %E A228327 More terms from _Alois P. Heinz_, Aug 25 2013