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 A118527 #7 Jul 20 2015 11:37:49 %S A118527 1,9,17,79,105,509,913,327,731,145,549,953,367,771,185,589,993,407, %T A118527 712,225,530,43,42,32,31,21,20,10,9,17,79,105,509,913,327,731,145,549, %U A118527 953,367,771,185,589,993,407,712,225,530,43,42,32,31,21,20,10,9 %N A118527 Start with 1 and repeatedly reverse the digits and add 8 to get the next term. %H A118527 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %H A118527 <a href="/index/Rec#order_27">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1). %F A118527 After 1 step enters a cycle of length 27. %Y A118527 Cf. A117828, A117816, A117817. %K A118527 nonn,base %O A118527 1,2 %A A118527 _N. J. A. Sloane_, May 06 2006