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 A118151 #4 May 26 2014 23:48:47 %S A118151 1,55,109,955,613,370,127,775,631,190,145,595,649,1000,55,109,955,613, %T A118151 370,127,775,631,190,145,595,649,1000,55,109,955,613,370,127,775,631, %U A118151 190,145,595,649,1000,55,109,955,613,370,127,775,631,190,145,595,649 %N A118151 Start with 1 and repeatedly reverse the digits and add 54 to get the next term. %C A118151 After 1 step enters a cycle of 13. %H A118151 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %Y A118151 Cf. A117828, A117816, A117817. %K A118151 base,nonn,less %O A118151 1,2 %A A118151 Luc Stevens (lms022(AT)yahoo.com), May 14 2006