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 A118528 #7 Jul 20 2015 10:57:40 %S A118528 1,12,32,34,54,56,76,78,98,100,12,32,34,54,56,76,78,98,100,12,32,34, %T A118528 54,56,76,78,98,100,12,32,34,54,56,76,78,98,100,12,32,34,54,56,76,78, %U A118528 98,100,12,32,34,54,56,76,78,98,100,12,32,34,54,56,76,78,98,100 %N A118528 Start with 1 and repeatedly reverse the digits and add 11 to get the next term. %H A118528 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %H A118528 <a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 1). %F A118528 After 1 step enters a cycle of length 9. %Y A118528 Cf. A117828, A117816, A117817. %K A118528 nonn,base %O A118528 1,2 %A A118528 _N. J. A. Sloane_, May 06 2006