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 A117150 #2 Mar 30 2012 17:27:48 %S A117150 4,5,7,9,13,8,11,15,21,29,41,57,81,48,67,95,56,79,111,157,92,54,32,45, %T A117150 63,89,125,177,104,147,207,293,172,243,343,485,685,969,568,803,1135, %U A117150 1605,2269,3209,1880,2659,1558,2203,3115,4405,6229,8809,12457,17617 %N A117150 Retrograde trajectory of 4 under map k -> A094077(k). %C A117150 Also trajectory of 4 under map k -> A115966(k). %C A117150 Conjecture: Sequence is not periodic. %C A117150 For the trajectory of 4 under map k -> A094077(k) see A117149. %Y A117150 Cf. A094077, A115966, A117149. %K A117150 nonn %O A117150 0,1 %A A117150 _Klaus Brockhaus_, Feb 28 2006