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 A118200 #8 Jul 17 2020 16:48:01 %S A118200 1,67,142,307,769,1033,3367,7699,10033,33067,76099,99133,33265,56299, %T A118200 99331,13465,56497,79531,13663,36697,79729,92863,36895,59929,93061, %U A118200 16105,50227,72271,17293,39337,73459,95503,30625,52669,96691,19735 %N A118200 Start with 1 and repeatedly reverse the digits and add 66 to get the next term. %C A118200 After 5 steps enters a cycle of 264. %H A118200 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %Y A118200 Cf. A117828, A117816, A117817. %K A118200 base,nonn,less,easy %O A118200 1,2 %A A118200 Luc Stevens (lms022(AT)yahoo.com), May 14 2006 %E A118200 a(32) corrected by _Georg Fischer_, Jul 17 2020