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 A118215 #4 May 26 2014 23:48:47 %S A118215 1,69,164,529,993,467,832,306,671,244,510,83,106,669,1034,4369,9702, %T A118215 2147,7480,915,587,853,426,692,364,531,203,370,141,209,970,147,809, %U A118215 976,747,815,586,753,425,592,363,431,202,270,140,109,969,1037,7369,9705 %N A118215 Start with 1 and repeatedly reverse the digits and add 68 to get the next term. %C A118215 After 31 steps enters a cycle of 36. %H A118215 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %Y A118215 Cf. A117828, A117816, A117817. %K A118215 base,nonn,less %O A118215 1,2 %A A118215 Luc Stevens (lms022(AT)yahoo.com), May 14 2006