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 A181906 #21 Apr 02 2012 23:05:12 %S A181906 3,6,8,7,1,9,6,8,7,3,3,1,4,7,4,2,3,5,7,1,9,6,3,8,2,5,1,1,3,6,3,3,8,8, %T A181906 4,5,9,9,2,0,0,0,4,9,8,5,1,4,1,9,7,2,8,3,0,6,6,2,6,5,7,7,2,1,9,2,3,0, %U A181906 2,5,7,8,9,3,5,4,4,6,2,7,7,9,7,2,6,6,7,3,0,9,5,8,3,5,4,3,0,2,8,9 %N A181906 The value of r at the onset of the first period-9 cycle of the logistic map f(x) = r*x*(1 - x). %C A181906 Root of a degree 240*2 = 480 polynomial. %H A181906 Cheng Zhang, <a href="/A181906/a181906.txt">the polynomial for T = r*(r-2)</a> %e A181906 3.6871968733... %Y A181906 Cf. A086178, A086179, A086180, A086181, A091517, A118452, A118453, A118746, A181907, A181909, A181910, A181911, A181912, A181913, A181915, A181916, A181917, A181918, A181919. %K A181906 nonn,cons %O A181906 1,1 %A A181906 _Cheng Zhang_, Apr 01 2012