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 A118218 #4 May 26 2014 23:48:47 %S A118218 1,72,98,160,132,302,274,543,416,685,657,827,799,1068,8672,2839,9453, %T A118218 3620,334,504,476,745,618,887,859,1029,9272,2800,153,422,295,663,437, %U A118218 805,579,1046,6472,2817,7253,3598,9024,4280,895,669,1037,7372,2808,8153 %N A118218 Start with 1 and repeatedly reverse the digits and add 71 to get the next term. %C A118218 After 33 steps enters a cycle of 18. %H A118218 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %Y A118218 Cf. A117828, A117816, A117817. %K A118218 base,nonn,less %O A118218 1,2 %A A118218 Luc Stevens (lms022(AT)yahoo.com), May 14 2006